-ic a-a a-b a-c a-i aaa aab aac aag aai aao aar ab- aba abb abc abg abi abo abr ac- aca acb acc acg aci aco acr ag- aga agb agc agg agi ago agr ai- aia aib aic aig aii aio air aoa aob aoc aog aoi aoo aor ar- ara arb arc arg ari aro arr baa bab bac bag bai bao bar bba bbb bbc bbg bbi bbo bbr bca bcb bcc bcg bci bco bcr bga bgb bgc bgg bgi bgo bgr bi- bia bib bic big bii bio bir boa bob boc bog boi boo bor bra brb brg bri bro brr c-- caa cab cac cag cai cao car cba cbb cbc cbg cbi cbo cbr cca ccb ccc ccg cci cco ccr cga cgb cgc cgg cgi cgo cgr ci- cia cib cic cig cii cio cir co- coa cob coc cog coi coo cor cra crb crc crg cri cro crr gaa gab gac gag gai gao gar gba gbc gbg gbi gbo gbr gca gcb gcc gcg gci gco gcr gga ggb ggc ggg ggi ggo ggr gia gib gic gig gii gio gir goa gob goc gog goi goo gor gra grb grc grg gri gro grr ia- iaa iab iac iag iai iao iar iba ibb ibc ibg ibi ibo ibr ica icb icc icg ici ico icr iga igb igc igg igi igo igr iia iib iic iii iio iir io- ioa iob ioc iog ioi ioo ior ir- ira irb irc irg iri iro irr o-i oaa oab oac oag oai oao oar ob- oba obb obc obg obi obo obr oc- oca ocb occ ocg oci oco ocr oga ogc ogg ogi ogo oia oib oic oii oio oir oo- ooa oob ooc oog ooi ooo oor or- ora orb orc org ori oro orr ra- raa rab rac rag rai rao rar rba rbb rbc rbg rbi rbo rbr rca rcb rcc rcg rci rco rcr rga rgb rgc rgg rgi rgo rgr ria rib ric rig rii rio rir roa rob roc rog roi roo ror rra rrb rrc rrg rri rrr