-th b-u bbb bbc bbh bbk bbo bbt bbu bcb bcc bch bck bco bct bcu bhb bhc bhh bhk bho bht bhu bkb bkc bkk bko bkt bob boc boh bok boo bot bou btb btc bth btk bto btt btu bub buc buh buk buo but buu c-- cbb cbc cbh cbk cbo cbt cbu ccb ccc cch cck cco cct ccu ch- chb chc chh chk cho cht chu ckb ckc ckh cko ckt co- cob coc coh cok coo cot cou ctb ctc cth ctk cto ctt ctu cub cuc cuh cuk cuo cut cuu hbb hbc hbh hbk hbo hbt hbu hcb hcc hch hck hco hct hhb hhc hhh hhk hho hht hhu hkb hkh hkk hko hkt hku hob hoc hoh hok hoo hot hou htb htc hth htk hto htt hub huc huh huk huo hut huu k-t kbb kbc kbh kbk kbo kbu kcb kcc kch kck kct kcu khh khk kho khu kkb kkc kkh kkk kkt kku kob koc koh kok koo kot kou ktb ktc kth ktk kto ktt ktu kub kuc kuh kuk kut kuu ob- obb obc obh obk obo obt obu oc- ocb occ och ock oco oct ocu ohc ohh oho oht ohu okb okc okk oko oku oo- oob ooc ooh ook ooo oot ot- otb otc oth otk oto ott otu ou- ouc ouh ouk ouo out tbb tbc tbh tbk tbo tbt tbu tcb tcc tch tck tco tct tcu th- thb thc thh thk tho tht thu tkb tkc tkk tko tkt to- tob toc toh tok too tot tou ttb ttc tth ttk tto ttt ttu tub tuc tuh tuk tuo tut tuu ubb ubc ubh ubk ubo ubt ubu ucb ucc uch uck uco uct ucu uhb uhc uhh uho uht uhu ukb ukc ukk uku uob uoc uok uoo uot utb utc uth utk uto utt utu uuc uut uuu