IPST-SE with Random RELAY4i (Can select amount of the CHs)

#include <ipst.h>
int x,xxxx,yyyy,zzzz,zzzz2,zzzz3;
#define RELAY1  19
#define RELAY2  20
#define RELAY3  21
#define RELAY4  22
byte relays[4] = {RELAY1,RELAY2,RELAY3,RELAY4};
void setup()
{
  //OK();// Wait for OK button
  glcdClear();
  glcdMode(2);
  setTextSize(23);
  setTextColor(GLCD_GREEN);
}

void loop()
{
  glcd(0,0,"%d",knob(1,5));
  if(sw_OK())
  {
    if(knob(1,5)==1)
    {
      for(x=0;x<20;x++){
      for(int xxxx=0;xxxx<4;xxxx++){  out(relays[xxxx],0); }
        out(relays[random(0, 4)],1);
        delay(random(75,100));
      }
      }
    else if(knob(1,5)==2)
    {
      while(1){
      for(x=0;x<10;x++){
      for(int xxxx=0;xxxx<4;xxxx++){  out(relays[xxxx],0); }
       yyyy=relays[random(0, 4)];
       zzzz=relays[random(0, 4)];
       out(yyyy,1);
       out(zzzz,1);
        delay(random(75,100));
        }
       if(yyyy==zzzz)
       {
         x=0;
       }
       else{break;}
      }
    }
    else if(knob(1,5)==3)
    {
      while(1){
      for(x=0;x<5;x++){
      for(int xxxx=0;xxxx<4;xxxx++){  out(relays[xxxx],0); }
       yyyy=relays[random(0, 4)];
       zzzz=relays[random(0, 4)];
       zzzz2=relays[random(0, 4)];
       out(yyyy,1);
       out(zzzz,1);
       out(zzzz2,1);
        delay(random(75,100));
        }
       if(yyyy==zzzz || yyyy==zzzz2 || zzzz==zzzz2)
       {
         x=0;
       }
       else{break;}
      }
    }
    else if(knob(1,5)==4)
    {
      for(int xxxx=0;xxxx<4;xxxx++){  out(relays[xxxx],0); }
      for(int xxxx=0;xxxx<4;xxxx++){out(relays[xxxx],1);}
  }
}
}