-ic b-u bbb bbc bbi bbt bbu bcb bcc bci bct bcu bi- bib bic bii bit biu btb btc bti btt btu bub buc bui but buu c-- cbb cbc cbi cbt cbu ccb ccc cci cct ccu ci- cib cic cii cit ciu ctb ctc cti ctt ctu cub cuc cui cut cuu ibb ibc ibi ibt ibu icb icc ici ict icu iib iic iii iit iiu itb itc iti itt itu iu- iub iuc iui iut tbb tbc tbi tbt tbu tcb tcc tci tct tcu tib tic tii tit tiu ttb ttc tti ttt ttu tub tuc tui tut tuu ubb ubc ubi ubt ubu ucb ucc uci uct ucu uib uic uii uit uiu utb utc uti utt utu uuc uut uuu