-ic bbb bbc bbi bbk bbr bby bcb bcc bci bck bcr bcy bi- bib bic bii bik bir biy bkb bkc bkk bkr brb bri brk brr bry by- byc byi byk byr c-- cbb cbc cbi cbk cbr cby ccb ccc cci cck ccr ci- cib cic cii cik cir ckb ckc cki cky crb crc cri crk crr cry cyb cyc cyk cyr ibb ibc ibi ibk ibr iby icb icc ici ick icr icy iib iic iii iir ikb ikc iki ikk ikr ir- irb irc iri irk irr iry iyc iyr iyy kbb kbc kbi kbk kbr kcb kcc kci kck kcr kib kic kii kik kir kkb kkc kki kkk kkr kky krc kri krk krr kry kyc kyr rbb rbc rbi rbk rbr rcb rcc rci rcr rib ric rii rik rir riy rkb rkc rkk rky rrb rrc rri rrk rrr ry- ryc ryk ryr ryy ybc ybi ybr yby ycc yci ycy yii yir yki ykk yrc yyb yyc yyy