//--------------------- INCLUDE LIBRARIES ----------------------------
  #include <Servo.h> // SERVO
  #include <SPI.h>  // OLED 
  #include <Wire.h> // OLED
  #include <Adafruit_GFX.h> // OLED
  #include <Adafruit_SSD1306.h> // OLED
//--------------------- OLED DEFINE ------------------------------------ 
  #define SCREEN_WIDTH 128 // OLED display width, in pixels
  #define SCREEN_HEIGHT 64 // OLED display height, in pixels
  #define OLED_RESET -1     // OLED reset pin
  #define I2C_ADDRESS 0x3C  // Define address                                        
  Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
//--------------------- CREATE MOTOR OBJECTS ----------------------------
  Servo Tip_Down;  // servo object to control a servo
  Servo Jaw;  // servo object to control a servo
  Servo servo_Z;  // servo object to control a servo
  Servo servo_X;  // servo object to control a servo
  Servo servo_C;  // servo object to control a servo
  Servo servo_Tip_Up;  // servo object to control a servo
  Servo servo_B;  // servo object to control a servo
  Servo servo_Sides;  // servo object to control a servo
//--------------------- CREATE BUTTONS ---------------------------------------

int dial_value = 0; // Used to determine value of buttons
//--------------------- CREATE DISPLAY NAMES ------------------------------
  char *sound_item[] = {"/ch/", "chair",
                        "/d/", "do",
                        "/g/", "go",
                        "/j/", "judge",
                        "/k/", "kick",
                        "/l/", "like",
                        "/n/", "no",
                        "/ng/", "sing",
                        "/r/", "retroflex",
                        "/s/", "sad",
                        "/sh/", "shut",
                        "/t/", "tap",
                        "/th/", "think",
                        "/th/", "voiceless",
                        "/z/", "zoo"};
//--------------------- VARIABLES USED WITHIN CODE -------------------------
int number_of_sounds = 15; // Used to divide poteniometer into the amount of sounds programmed

void setup() { // THIS LOOP RUNS ONE TIME TO "ACTIVATE" ELECTRONICS
 Serial.begin(115200); // Rate of serial data transmission (bits per second "baud")
  // OLED: Initalize and Define
    display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
    display.clearDisplay();
 
  // SERVO MOTORS: Define Pins
    Tip_Down.attach(A1);  // Tip Down
    Jaw.attach(5);  // Jaw
    servo_Z.attach(7);  // Z
    servo_X.attach(6);  // X
    servo_C.attach(A2);  // C
    servo_Tip_Up.attach(A3);  // Tip Up
    servo_B.attach(A0);  // B
    servo_Sides.attach(9);  // Sides
  // SERVO MOTORS: Define Pins
  int tip_down = 180; int tip_up = 160; int servo_b = 0; int servo_c = 180; int servo_sides = 3; int jaw = 20; int servo_x = 3; int servo_z = 180;
  Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
  // BUTTONS
  pinMode(2, INPUT_PULLUP);

}

void loop() { // MAIN PROGRAM
  // VARIABLES THAT LOOP 1 TIME
  byte old_dial_value = 100; // compare if the poteniometer has entered a new state
  unsigned int first; // used to change display only on first new iteration for poteniometer 
  unsigned int wanted_wait_time = 3000; // milliseconds. Time for the motors to pause in position
  byte clicked = 1; // use to get rid of second movement to position
  byte up_clicked = 1;
  byte down_clicked = 1;
  int time_past = 1000; // milliseconds
  int dial_value;
  int trigger = 0;
  int button = 2;
  int tip_down = 180; int tip_up = 160; int servo_b = 0; int servo_c = 180; int servo_sides = 3; int jaw = 20; int servo_x = 3; int servo_z = 180; // not linked to servo in setup

  while(1){ // THIS LOOP RUNS INDEFINITLEY

    dial_value = ceil(analogRead(A7)/73); // convert poteniometer signal to variable

    if (old_dial_value != dial_value){ // if the rotary encoder changes its value, the screen will clear itself
      display.clearDisplay();
      
      first = 1;    // updates the value of first to display the new sound 
    }

    switch (dial_value){ // Switches between possible sounds from movement of rotary encoder
      case 0: // ch
          old_dial_value = 0; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(20,5);  display.println(sound_item[0]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(35,45); display.println(sound_item[1]); display.display(); // display "EXAMPLE"
          }
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED 
            Tip_Down.write(180); servo_Tip_Up.write(70); servo_B.write(0); servo_C.write(180);   servo_Sides.write(3); Jaw.write(30); servo_X.write(30); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 1: // d
          old_dial_value = 1; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[2]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(52,45); display.println(sound_item[3]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(100); servo_B.write(20); servo_C.write(160);  servo_Sides.write(3); Jaw.write(30); servo_X.write(10); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 2: // g
          old_dial_value = 2; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[4]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(52,45); display.println(sound_item[5]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(180); servo_B.write(0); servo_C.write(180);   servo_Sides.write(3); Jaw.write(30); servo_X.write(0); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 3: // j (no j clay image)
          old_dial_value = 3; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[6]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(45,45); display.println(sound_item[7]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(160); servo_B.write(0); servo_C.write(180);   servo_Sides.write(3); Jaw.write(30); servo_X.write(0); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino 
            delay(wanted_wait_time);
           Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 4: //k
          old_dial_value = 4; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[8]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(38,45); display.println(sound_item[9]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(180); servo_B.write(0); servo_C.write(180);   servo_Sides.write(3); Jaw.write(30); servo_X.write(0); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 5:// l (ch but further forward)
          old_dial_value = 5; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[10]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(45,45); display.println(sound_item[11]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(70); servo_B.write(0); servo_C.write(180);   servo_Sides.write(3); Jaw.write(30); servo_X.write(50); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 6: // n
          old_dial_value = 6; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[12]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(45,45); display.println(sound_item[13]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(160); servo_B.write(20); servo_C.write(160);   servo_Sides.write(3); Jaw.write(30); servo_X.write(5); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }

        break; // Exits case statment
      case 7: // ng
          old_dial_value = 7; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[14]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(52,45); display.println(sound_item[15]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(170); servo_B.write(40); servo_C.write(180);   servo_Sides.write(10); Jaw.write(30); servo_X.write(0); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }

        break; // Exits case statment
      case 8: //r
          old_dial_value = 8; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[16]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(11,45); display.println(sound_item[17]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(70); servo_B.write(30); servo_C.write(150);   servo_Sides.write(3); Jaw.write(30); servo_X.write(0); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 9: // s (same as z)
          old_dial_value = 9; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[18]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(28,45); display.println(sound_item[19]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(160); servo_B.write(0); servo_C.write(180);   servo_Sides.write(30); Jaw.write(30); servo_X.write(0); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 10: // sh (same as s and z but Z servo lifts)
          old_dial_value = 10; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[20]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(44,45); display.println(sound_item[21]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(160); servo_B.write(0); servo_C.write(180);   servo_Sides.write(30); Jaw.write(30); servo_X.write(0); servo_Z.write(170); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 11: // t
          old_dial_value = 11; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(18,5);  display.println(sound_item[22]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(40,45); display.println(sound_item[23]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(70); servo_B.write(40); servo_C.write(180);   servo_Sides.write(3); Jaw.write(30); servo_X.write(5); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 12: // th (Voiced)
          old_dial_value = 12; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[24]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(10,45); display.println(sound_item[25]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(160); servo_B.write(0); servo_C.write(180);   servo_Sides.write(3); Jaw.write(180); servo_X.write(40); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 13: // th (Voiceless)
          old_dial_value = 13; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(20,5);  display.println(sound_item[26]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(10,45); display.println(sound_item[27]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(160); servo_B.write(0); servo_C.write(180);   servo_Sides.write(3); Jaw.write(180); servo_X.write(40); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
           Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
      case 14: // z (same as s)
          old_dial_value = 14; // tells program that it was in this state last for the next loop
          if (first == 1){ // IF IT IS THE FIRST TIME THE KNOB HAS BEEN MOVED TO THIS CASE
            first = 0; // Reset so the next iteration knows it is not the first time at this case
            display.setTextSize(4); display.setTextColor(WHITE);  display.setCursor(28,5);  display.println(sound_item[28]); // display "/SOUND/"
            display.setTextSize(2); display.setTextColor(WHITE);  display.setCursor(45,45); display.println(sound_item[29]); display.display(); }// display "EXAMPLE"
          if (digitalRead(button) == trigger){ // IF THE BUTTON IS CLICKED
            Tip_Down.write(180); servo_Tip_Up.write(160); servo_B.write(0); servo_C.write(180);   servo_Sides.write(30); Jaw.write(30); servo_X.write(0); servo_Z.write(180); // Position Motors// Moves tongue to wanted position
            Serial.write(old_dial_value); // Send sound number to the audio arduino
            delay(wanted_wait_time);
            Tip_Down.write(tip_down); servo_Tip_Up.write(tip_up); servo_B.write(servo_b); servo_C.write(servo_c);   servo_Sides.write(servo_sides); Jaw.write(jaw); servo_X.write(servo_x); servo_Z.write(servo_z); // Zero Motor Positions
          }
        break; // Exits case statment
    }  // End of Case
    
  }// END OF WHILE
}