-ic a-a a-b a-c a-i aaa aab aac aag aai aar ab- aba abb abc abg abi abr ac- aca acb acc acg aci acr ag- aga agb agc agg agi agr ai- aia aib aic aig aii air ar- ara arb arc arg ari arr baa bab bac bag bai bar bba bbb bbc bbg bbi bbr bca bcb bcc bcg bci bcr bga bgb bgc bgg bgi bgr bi- bia bib bic big bii bir bra brb brg bri brr c-- caa cab cac cag cai car cba cbb cbc cbg cbi cbr cca ccb ccc ccg cci ccr cga cgb cgc cgg cgi cgr ci- cia cib cic cig cii cir cra crb crc crg cri crr gaa gab gac gag gai gar gba gbc gbg gbi gbr gca gcb gcc gcg gci gcr gga ggb ggc ggg ggi ggr gia gib gic gig gii gir gra grb grc grg gri grr ia- iaa iab iac iag iai iar iba ibb ibc ibg ibi ibr ica icb icc icg ici icr iga igb igc igg igi igr iia iib iic iii iir ir- ira irb irc irg iri irr ra- raa rab rac rag rai rar rba rbb rbc rbg rbi rbr rca rcb rcc rcg rci rcr rga rgb rgc rgg rgi rgr ria rib ric rig rii rir rra rrb rrc rrg rri rrr