12 ball

1  if A1A2A3A4 = B2B2B3B4 then odd one in C1C2C3C4
    { 2 if C1>C2 { 3 if C1>C3 then C1 is odd and heavy else if C1    else if A1A2A3A4 > B1B2B3B4 then C1C2C3C4 are good
{
2   if A1A2B1=A3B2C1  { problematic one is  A4 to be heavy or B3 or B4 to be light
    3 if B3=B4, odd one is A4 to be heavy, if B3>B4 then B3 is odd one, which is lighter  }
   else if A1A2B1 > A3B2C1   {problematic one is A1 A2 to be heavy or B2 to be light
    3 if A1=A2 B2 is odd one that is lighter, otherwise the heavy one of A1,A2 is odd}
   else if A2A2B1    3 if B1=C3 then A3 is odd and to be heavy else if B1 is the odd and to be lighter than normal
    }
}