b-u bbb bbc bbt bbu bcb bcc bct bcu bcz btb btc btt btu btz bub buc but buu buz bzu bzz c-- cbb cbc cbt cbu cbz ccb ccc cct ccu ccz ctb ctc ctt ctu ctz cub cuc cut cuu cuz cz- czc czt tbb tbc tbt tbu tbz tcb tcc tct tcu ttb ttc ttt ttu tub tuc tut tuu tuz tzu ubb ubc ubt ubu ucb ucc uct ucu utb utc utt utu utz uuc uut uuu uzb uzu zbb zbc zbt zub zuc zut zuz zzt zzz