-ic a-a a-b a-c a-i aaa aab aac aag aai aan aar ab- aba abb abc abg abi abn abr ac- aca acb acc acg aci acn acr ag- aga agb agc agg agi agn agr ai- aia aib aic aig aii ain air an- ana anb anc ang ani ann anr ar- ara arb arc arg ari arn arr baa bab bac bag bai ban bar bba bbb bbc bbg bbi bbn bbr bca bcb bcc bcg bci bcn bcr bga bgb bgc bgg bgi bgn bgr bi- bia bib bic big bii bin bir bna bnb bnc bng bni bnn bnr bra brb brg bri brn brr c-- caa cab cac cag cai can car cba cbb cbc cbg cbi cbn cbr cca ccb ccc ccg cci ccn ccr cga cgb cgc cgg cgi cgn cgr ci- cia cib cic cig cii cin cir cn- cna cnb cnc cng cni cnn cnr cra crb crc crg cri crn crr gaa gab gac gag gai gan gar gba gbc gbg gbi gbn gbr gca gcb gcc gcg gci gcn gcr gga ggb ggc ggg ggi ggn ggr gia gib gic gig gii gin gir gna gnb gnc gni gnn gnr gra grb grc grg gri grn grr ia- iaa iab iac iag iai ian iar iba ibb ibc ibg ibi ibn ibr ica icb icc icg ici icn icr iga igb igc igg igi ign igr iia iib iic iii iin iir in- ina inb inc ing ini inn inr ir- ira irb irc irg iri irn irr n-i naa nab nac nag nai nan nar nba nbb nbc nbg nbi nbn nbr nca ncb ncc ncg nci ncn ncr nga ngb ngc ngg ngi ngn nia nib nic nig nii nin nir nna nnb nnc nng nni nnn nra nrb nrc nrg nri nrn nrr ra- raa rab rac rag rai ran rar rba rbb rbc rbg rbi rbn rbr rca rcb rcc rcg rci rcn rcr rga rgb rgc rgg rgi rgn rgr ria rib ric rig rii rin rir rna rnb rnc rng rni rnn rnr rra rrb rrc rrg rri rrn rrr