Some programs have been specifically written to attack others. Here is a list
of the most interesting combinations:

 1 x "Copy"                  +  1 x "Random"

 1 x "Copy"                  +  1 x "Search and destroy"

30 x "Self mover"            +  1 x "Imp grabber"

20 x "Memory eraser"         + 20 x "Gemini"

10 x "An endless loop"       +  5 x "Jump up"

 1 x "Capture"               + 10 x "2nd Self mover killer"

 1 x "Imp killer cascade"    +  5 x "Self mover"

 1 x "Santa's little helper" +  1 x "Search & Destroy (2)"

 1 x "Santa's little helper" +  1 x "Search & Destroy (2)" + 1 x "The devil"

 1 x "The hitchhikers devil" +  1 x "Search & Destroy (2)"

50 x "Imp killer 5"          +  1 x "Pong Missile 3"