void setup() {
  // put your setup code here, to run once:
  volatile char *dir1,*dir2,*dir3,*dir4;
  dir1=0x30;
  dir2=0x107;
  dir3=0x21;
  dir4=0x27;
  *dir1=0xFF;
  *dir2=0xFF;
  *dir3=0xFF;
  *dir4=0xFF;

}

void loop() {
  // put your main code here, to run repeatedly:
  volatile char *out1,*out2,*out3,*out4;
  out1=0x31;
  out2=0x108;
  out3=0x22;
  out4=0x28;
  long a[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
  long b[]={0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF};
  volatile long i;
  long j,k,l,m;
  for (j=0;j<10;j++)
  {
    if (j==0)
    {
      *out1=0;
      for (k=0;k<10;k++)
      {
        if (k==0)
        {
          *out2=0;
          for (l=0;l<10;l++)
          {
            if (l==0)
            {
              *out3=0;
              for (m=0;m<10;m++)
              {
                *out4=a[m];
                for (i=0;i<100000;i++);
              }
            }
            else
            {
              *out3=a[l];
              for (m=0;m<10;m++)
              {
                *out4=a[m];
                for (i=0;i<100000;i++);
              }
              for (i=0;i<100000;i++);
            }
          }
        }
        else
        {
          *out2=a[k];
          for (l=0;l<10;l++)
          {
            *out3=a[l];
            {
              for (m=0;m<10;m++)
              {
                *out4=a[m];
                for (i=0;i<100000;i++);
              }
            }
            for (i=0;i<100000;i++);
          }
          for (i=0;i<100000;i++);
        }

      }
    }
    else
    {
      *out1=a[j];
      for (k=0;k<10;k++)
      {
        *out2=a[k];
        for (l=0;l<10;l++)
        {
          *out3=a[l];
          for (m=0;m<10;m++)
          {
            *out4=a[m];
            for (i=0;i<100000;i++);
          }
          for (i=0;i<100000;i++);
        }
        for (i=0;i<100000;i++);
      }
      for (i=0;i<100000;i++);
    }
  }
  
}