-ic a-a a-b a-c a-i aaa aab aac aag aai aan aao aar ab- aba abb abc abg abi abn abo abr ac- aca acb acc acg aci acn aco acr ag- aga agb agc agg agi agn ago agr ai- aia aib aic aig aii ain aio air an- ana anb anc ang ani ann ano anr aoa aob aoc aog aoi aon aoo aor ar- ara arb arc arg ari arn aro arr baa bab bac bag bai ban bao bar bba bbb bbc bbg bbi bbn bbo bbr bca bcb bcc bcg bci bcn bco bcr bga bgb bgc bgg bgi bgn bgo bgr bi- bia bib bic big bii bin bio bir bna bnb bnc bng bni bnn bno bnr boa bob boc bog boi bon boo bor bra brb brg bri brn bro brr c-- caa cab cac cag cai can cao car cba cbb cbc cbg cbi cbn cbo cbr cca ccb ccc ccg cci ccn cco ccr cga cgb cgc cgg cgi cgn cgo cgr ci- cia cib cic cig cii cin cio cir cn- cna cnb cnc cng cni cnn cno cnr co- coa cob coc cog coi con coo cor cra crb crc crg cri crn cro crr gaa gab gac gag gai gan gao gar gba gbc gbg gbi gbn gbo gbr gca gcb gcc gcg gci gcn gco gcr gga ggb ggc ggg ggi ggn ggo ggr gia gib gic gig gii gin gio gir gna gnb gnc gni gnn gno gnr goa gob goc gog goi gon goo gor gra grb grc grg gri grn gro grr ia- iaa iab iac iag iai ian iao iar iba ibb ibc ibg ibi ibn ibo ibr ica icb icc icg ici icn ico icr iga igb igc igg igi ign igo igr iia iib iic iii iin iio iir in- ina inb inc ing ini inn ino inr io- ioa iob ioc iog ioi ion ioo ior ir- ira irb irc irg iri irn iro irr n-i naa nab nac nag nai nan nao nar nba nbb nbc nbg nbi nbn nbo nbr nca ncb ncc ncg nci ncn nco ncr nga ngb ngc ngg ngi ngn ngo nia nib nic nig nii nin nio nir nna nnb nnc nng nni nnn nno no- noa nob noc nog noi non noo nor nra nrb nrc nrg nri nrn nro nrr o-i oaa oab oac oag oai oan oao oar ob- oba obb obc obg obi obn obo obr oc- oca ocb occ ocg oci ocn oco ocr oga ogc ogg ogi ogn ogo oia oib oic oii oin oio oir on- ona onb onc ong oni onn ono onr oo- ooa oob ooc oog ooi oon ooo oor or- ora orb orc org ori orn oro orr ra- raa rab rac rag rai ran rao rar rba rbb rbc rbg rbi rbn rbo rbr rca rcb rcc rcg rci rcn rco rcr rga rgb rgc rgg rgi rgn rgo rgr ria rib ric rig rii rin rio rir rna rnb rnc rng rni rnn rno rnr roa rob roc rog roi ron roo ror rra rrb rrc rrg rri rrn rrr