-th a-a a-b a-c a-t a-z aaa aab aac aah aat aau aaz ab- aba abb abc abh abt abu abz ac- aca acb acc ach act acu acz aha ahb ahc ahh aht ahu ahz at- ata atb atc ath att atu atz au- aua aub auc auh aut auz az- aza azb azt azu azz b-u baa bab bac bah bat bau baz bba bbb bbc bbh bbt bbu bca bcb bcc bch bct bcu bcz bha bhb bhc bhh bht bhu bta btb btc bth btt btu btz bua bub buc buh but buu buz bza bzh bzu bzz c-- caa cab cac cah cat cau caz cba cbb cbc cbh cbt cbu cbz cca ccb ccc cch cct ccu ccz ch- cha chb chc chh cht chu chz cta ctb ctc cth ctt ctu ctz cua cub cuc cuh cut cuu cuz cz- czc czt haa hab hac hah hat hau haz hba hbb hbc hbh hbt hbu hbz hca hcb hcc hch hct hha hhb hhc hhh hht hhu hhz hta htb htc hth htt htz hua hub huc huh hut huu huz hzt taa tab tac tah tat tau taz tba tbb tbc tbh tbt tbu tbz tca tcb tcc tch tct tcu th- tha thb thc thh tht thu thz tta ttb ttc tth ttt ttu tua tub tuc tuh tut tuu tuz tza tzu ua- uaa uab uac uah uat uau uaz uba ubb ubc ubh ubt ubu uca ucb ucc uch uct ucu uha uhb uhc uhh uht uhu uta utb utc uth utt utu utz uua uuc uut uuu uza uzb uzh uzu zaa zab zac zah zat zaz zbb zbc zbt zha zhc zhu zta zub zuc zut zuz zzt zzz