-ic a-a a-b a-c a-i aaa aab aac aaf aag aai aao aar ab- aba abb abc abf abg abi abo abr ac- aca acb acc acf acg aci aco acr af- afa afb afc aff afg afi afo afr ag- aga agb agc agf agg agi ago agr ai- aia aib aic aif aig aii aio air aoa aob aoc aof aog aoi aoo aor ar- ara arb arc arf arg ari aro arr baa bab bac baf bag bai bao bar bba bbb bbc bbf bbg bbi bbo bbr bca bcb bcc bcf bcg bci bco bcr bfa bfb bfc bff bfg bfi bfo bfr bga bgb bgc bgf bgg bgi bgo bgr bi- bia bib bic bif big bii bio bir boa bob boc bof bog boi boo bor bra brb brf brg bri bro brr c-- caa cab cac caf cag cai cao car cba cbb cbc cbf cbg cbi cbo cbr cca ccb ccc ccf ccg cci cco ccr cfa cfb cfc cff cfg cfi cfo cfr cga cgb cgc cgg cgi cgo cgr ci- cia cib cic cif cig cii cio cir co- coa cob coc cof cog coi coo cor cra crb crc crf crg cri cro crr faa fab fac faf fag fai fao far fba fbb fbc fbf fbg fbi fbo fbr fca fcb fcc fcf fcg fci fco fcr ffa ffc fff ffg ffi ffo ffr fga fgb fgc fgf fgg fgi fgr fia fib fic fif fig fii fir foa fob foc fof fog foi foo for fra frb frc frf frg fri fro frr gaa gab gac gaf gag gai gao gar gba gbc gbf gbg gbi gbo gbr gca gcb gcc gcf gcg gci gco gcr gfa gfb gfc gff gfi gfo gfr gga ggb ggc ggg ggi ggo ggr gia gib gic gif gig gii gio gir goa gob goc gof gog goi goo gor gra grb grc grf grg gri gro grr i-f ia- iaa iab iac iaf iag iai iao iar iba ibb ibc ibf ibg ibi ibo ibr ica icb icc icf icg ici ico icr ifa ifb ifc iff ifg ifi ifo ifr iga igb igc igf igg igi igo igr iia iib iic iif iii iio iir io- ioa iob ioc iof iog ioi ioo ior ir- ira irb irc irf irg iri iro irr o-i oaa oab oac oaf oag oai oao oar ob- oba obb obc obf obg obi obo obr oc- oca ocb occ ocf ocg oci oco ocr of- ofa ofb ofc off ofg ofi ofo ofr oga ogc ogf ogg ogi ogo oia oib oic oif oii oio oir oo- ooa oob ooc oof oog ooi ooo oor or- ora orb orc orf org ori oro orr ra- raa rab rac raf rag rai rao rar rba rbb rbc rbf rbg rbi rbo rbr rca rcb rcc rcf rcg rci rco rcr rfa rfb rfc rff rfg rfi rfo rfr rga rgb rgc rgf rgg rgi rgo rgr ria rib ric rif rig rii rio rir roa rob roc rof rog roi roo ror rra rrb rrc rrf rrg rri rrr