-ic a-a a-b a-c a-i aaa aab aac aag aai aak aar ab- aba abb abc abg abi abk abr ac- aca acb acc acg aci ack acr ag- aga agb agc agg agi agk agr ai- aia aib aic aig aii aik air aka akb akc akg aki akk akr ar- ara arb arc arg ari ark arr baa bab bac bag bai bak bar bba bbb bbc bbg bbi bbk bbr bca bcb bcc bcg bci bck bcr bga bgb bgc bgg bgi bgk bgr bi- bia bib bic big bii bik bir bka bkb bkc bkg bkk bkr bra brb brg bri brk brr c-- caa cab cac cag cai cak car cba cbb cbc cbg cbi cbk cbr cca ccb ccc ccg cci cck ccr cga cgb cgc cgg cgi cgr ci- cia cib cic cig cii cik cir cka ckb ckc cki cra crb crc crg cri crk crr gaa gab gac gag gai gak gar gba gbc gbg gbi gbk gbr gca gcb gcc gcg gci gck gcr gga ggb ggc ggg ggi ggr gia gib gic gig gii gik gir gka gkb gra grb grc grg gri grk grr ia- iaa iab iac iag iai iar iba ibb ibc ibg ibi ibk ibr ica icb icc icg ici ick icr iga igb igc igg igi igk igr iia iib iic iii iir ika ikb ikc iki ikk ikr ir- ira irb irc irg iri irk irr ka- kaa kab kac kag kai kak kar kba kbb kbc kbi kbk kbr kca kcb kcc kcg kci kck kcr kga kgb kgc kgi kia kib kic kig kii kik kir kkb kkc kki kkk kkr kra krc krg kri krk krr ra- raa rab rac rag rai rak rar rba rbb rbc rbg rbi rbk rbr rca rcb rcc rcg rci rcr rga rgb rgc rgg rgi rgk rgr ria rib ric rig rii rik rir rkb rkc rkg rkk rra rrb rrc rrg rri rrk rrr