comp20 comp21 D E F comp10 comp11 A B C comp50 comp51 X Y Z comp150 comp151 I J K comp250 comp251 L M N comp350 comp351 F S T comp450 comp451 S T U comp550 comp551 F G H 1 0 13 A 1 6 D E B C 1 0 13 A 1 6 I J B C