triplets should always be of form ( 2 k , 2 k + 1 , 2 k + 2 )
if ( ( L % 2 ) > 0 ) : NEW_LINE INDENT L += 1 ; NEW_LINE DEDENT possibleA = L ; NEW_LINE possibleB = L + 1 ; NEW_LINE possibleC = L + 2 ; NEW_LINE else : NEW_LINE