#NEWLINE# @ qc #NEWLINE# def substract_lists( x = list_ ( of = int_ ( min = 0 , max = 20 ) , max_length = 10 ) , y = list_ ( of = int_ ( min = 0 , max = 20 ) , max_length = 10 ) ) : #NEWLINE# #INDENT# assert ( set ( collector . substract_lists ( x , y ) ) == set ( [ item for item in x if ( item not in y ) ] ) )