-th b-u bbb bbc bbh bbo bbt bbu bbx bcb bcc bch bco bct bcu bcx bhb bhc bhh bho bht bhu bhx bob boc boh boo bot bou box btb btc bth bto btt btu btx bub buc buh buo but buu bux bxb bxo bxx c-- cbb cbc cbh cbo cbt cbu cbx ccb ccc cch cco cct ccu ccx ch- chb chc chh cho cht chu chx co- cob coc coh coo cot cou cox ctb ctc cth cto ctt ctu ctx cub cuc cuh cuo cut cuu cxc cxh cxo cxt cxx hbb hbc hbh hbo hbt hbu hbx hcb hcc hch hco hct hhb hhc hhh hho hht hhu hob hoc hoh hoo hot hou hox htb htc hth hto htt htx hub huc huh huo hut huu hux hxc ob- obb obc obh obo obt obu obx oc- ocb occ och oco oct ocu ocx ohc ohh oho oht ohu oo- oob ooc ooh ooo oot oox ot- otb otc oth oto ott otu ou- ouc ouh ouo out ox- oxb oxc oxo oxt oxx t-x tbb tbc tbh tbo tbt tbu tcb tcc tch tco tct tcu tcx th- thb thc thh tho tht thu thx to- tob toc toh too tot tou tox ttb ttc tth tto ttt ttu ttx tub tuc tuh tuo tut tuu tux txt txu ubb ubc ubh ubo ubt ubu ubx ucb ucc uch uco uct ucu uhb uhc uhh uho uht uhu uob uoc uoo uot uox utb utc uth uto utt utu utx uuc uut uuu uxb uxc uxo uxt uxu xbc xbx xcb xch xcx xht xoc xoo xot xox xtc xtx xxo xxx