Shell Programming and Scripting

#!/bin/bash
 
flag=0
 
for p1 in A1 TM MP
do
    for p2 in A1 TM MP
    do
  if [ "$p1" = "A1" ] && [ "$p2" = "A1" ]; then
   flag=1
  elif [ "$p1" = "TM" ] && [ "$p2" = "TM" ]; then
   flag=1;
  elif [ "$p1" = "TM" ] && [ "$p2" = "A1" ]; then
   flag=1;
  elif [ "$p1" = "MP" ] && [ "$p2" = "MP" ]; then
   flag=1;
  elif [ "$p1" = "MP" ] && [ "$p2" = "A1" ]; then
   flag=1;
  elif [ "$p1" = "MP" ] && [ "$p2" = "TM" ]; then
   flag=1;
  fi
 
  if [ "$flag" -eq "1" ]; then
   flag=0
 
  for mp1 in N1 N2
  do
   for mp2 in N1 N2
   do
    for mp3 in N1 N2
    do
     for mp4 in N1 N2
     do
      for mp5 in N1 N2
      do
       for mp6 in N1 N2
       do
        for mp7 in N1 N2
        do
         for mp8 in N1 N2
         do
 
          if [ "$mp1" = "N1" ] || [ "$mp2" = "N1" ] || [ "$mp3" = "N1" ] || [ "$mp4" = "N1" ] || [ "$mp5" = "N1" ] || [ "$mp6" = "N1" ] || [ "$mp7" = "N1" ] || [ "$mp8" = "N1" ]; then
           if [ "$mp1" = "N2" ] || [ "$mp2" = "N2" ] || [ "$mp3" = "N2" ] || [ "$mp4" = "N2" ] || [ "$mp5" = "N2" ] || [ "$mp6" = "N2" ] || [ "$mp7" = "N2" ] || [ "$mp8" = "N2" ]; then
 
            echo " $p1 $p2 $mp1 $mp2 $mp3 $mp4 $mp5 $mp6 $mp7 $mp8 " >> Results.log
           fi
          fi
 
         done
        done
       done
      done
     done
    done
   done
  done
 
  fi
 
 done
done
echo Done.