-th b-u bbb bbc bbh bbt bbu bcb bcc bch bct bcu bhb bhc bhh bht bhu btb btc bth btt btu bub buc buh but buu c-- cbb cbc cbh cbt cbu ccb ccc cch cct ccu ch- chb chc chh cht chu ctb ctc cth ctt ctu cub cuc cuh cut cuu hbb hbc hbh hbt hbu hcb hcc hch hct hhb hhc hhh hht hhu htb htc hth htt hub huc huh hut huu tbb tbc tbh tbt tbu tcb tcc tch tct tcu th- thb thc thh tht thu ttb ttc tth ttt ttu tub tuc tuh tut tuu ubb ubc ubh ubt ubu ucb ucc uch uct ucu uhb uhc uhh uht uhu utb utc uth utt utu uuc uut uuu