-ic a-a a-b a-c a-i aaa aab aac aai aak aar ab- aba abb abc abi abk abr ac- aca acb acc aci ack acr ai- aia aib aic aii aik air aka akb akc aki akk akr ar- ara arb arc ari ark arr baa bab bac bai bak bar bba bbb bbc bbi bbk bbr bca bcb bcc bci bck bcr bi- bia bib bic bii bik bir bka bkb bkc bkk bkr bra brb bri brk brr c-- caa cab cac cai cak car cba cbb cbc cbi cbk cbr cca ccb ccc cci cck ccr ci- cia cib cic cii cik cir cka ckb ckc cki cra crb crc cri crk crr ia- iaa iab iac iai iar iba ibb ibc ibi ibk ibr ica icb icc ici ick icr iia iib iic iii iir ika ikb ikc iki ikk ikr ir- ira irb irc iri irk irr ka- kaa kab kac kai kak kar kba kbb kbc kbi kbk kbr kca kcb kcc kci kck kcr kia kib kic kii kik kir kkb kkc kki kkk kkr kra krc kri krk krr ra- raa rab rac rai rak rar rba rbb rbc rbi rbk rbr rca rcb rcc rci rcr ria rib ric rii rik rir rkb rkc rkk rra rrb rrc rri rrk rrr