-ic a-a a-b a-c a-i a-t aaa aab aac aai aak aar aat ab- aba abb abc abi abk abr abt ac- aca acb acc aci ack acr act ai- aia aib aic aii aik air ait aka akb akc aki akk akr ar- ara arb arc ari ark arr art at- ata atb atc ati atr att baa bab bac bai bak bar bat bba bbb bbc bbi bbk bbr bbt bca bcb bcc bci bck bcr bct bi- bia bib bic bii bik bir bit bka bkb bkc bkk bkr bkt bra brb bri brk brr brt bta btb btc bti btk btr btt c-- caa cab cac cai cak car cat cba cbb cbc cbi cbk cbr cbt cca ccb ccc cci cck ccr cct ci- cia cib cic cii cik cir cit cka ckb ckc cki ckt cra crb crc cri crk crr crt cta ctb ctc cti ctk ctr ctt ia- iaa iab iac iai iar iat iba ibb ibc ibi ibk ibr ibt ica icb icc ici ick icr ict iia iib iic iii iir iit ika ikb ikc iki ikk ikr ikt ir- ira irb irc iri irk irr irt ita itb itc iti itk itt k-t ka- kaa kab kac kai kak kar kat kba kbb kbc kbi kbk kbr kca kcb kcc kci kck kcr kct kia kib kic kii kik kir kit kkb kkc kki kkk kkr kkt kra krc kri krk krr krt kta ktb ktc ktk ktr ktt ra- raa rab rac rai rak rar rat rba rbb rbc rbi rbk rbr rbt rca rcb rcc rci rcr rct ria rib ric rii rik rir rit rkb rkc rkk rkt rra rrb rrc rri rrk rrr rrt rta rtb rtc rti rtk rtr rtt taa tab tac tai tak tar tat tba tbb tbc tbi tbk tbr tbt tca tcb tcc tci tck tcr tct tia tib tic tii tik tir tit tka tkb tkc tkk tkr tkt tra trb trc tri trk trr trt tta ttb ttc tti ttk ttr ttt