0 if 0 else 1 then . cr
 1 if 1 else 0 then . cr
 
 0 0 if 0 else if 0 else 1 then then . cr
 0 1 if if 0 else 1 then else 0 then . cr
 
 1 0 if 0 else if 1 else 0 then then . cr
 1 1 if if 1 else 0 then else 0 then . cr