-ic a-a a-b a-c a-i aaa aab aac aag aai aak aan aar ab- aba abb abc abg abi abk abn abr ac- aca acb acc acg aci ack acn acr ag- aga agb agc agg agi agk agn agr ai- aia aib aic aig aii aik ain air aka akb akc akg aki akk akn akr an- ana anb anc ang ani ank ann anr ar- ara arb arc arg ari ark arn arr baa bab bac bag bai bak ban bar bba bbb bbc bbg bbi bbk bbn bbr bca bcb bcc bcg bci bck bcn bcr bga bgb bgc bgg bgi bgk bgn bgr bi- bia bib bic big bii bik bin bir bka bkb bkc bkg bkk bkn bkr bna bnb bnc bng bni bnk bnn bnr bra brb brg bri brk brn brr c-- caa cab cac cag cai cak can car cba cbb cbc cbg cbi cbk cbn cbr cca ccb ccc ccg cci cck ccn ccr cga cgb cgc cgg cgi cgn cgr ci- cia cib cic cig cii cik cin cir cka ckb ckc cki cn- cna cnb cnc cng cni cnn cnr cra crb crc crg cri crk crn crr gaa gab gac gag gai gak gan gar gba gbc gbg gbi gbk gbn gbr gca gcb gcc gcg gci gck gcn gcr gga ggb ggc ggg ggi ggn ggr gia gib gic gig gii gik gin gir gka gkb gkn gna gnb gnc gni gnn gnr gra grb grc grg gri grk grn grr ia- iaa iab iac iag iai ian iar iba ibb ibc ibg ibi ibk ibn ibr ica icb icc icg ici ick icn icr iga igb igc igg igi igk ign igr iia iib iic iii iin iir ika ikb ikc iki ikk ikr in- ina inb inc ing ini ink inn inr ir- ira irb irc irg iri irk irn irr ka- kaa kab kac kag kai kak kan kar kba kbb kbc kbi kbk kbn kbr kca kcb kcc kcg kci kck kcn kcr kga kgb kgc kgi kia kib kic kig kii kik kin kir kkb kkc kki kkk kkn kkr kn- kna knc kng kni knk knn knr kra krc krg kri krk krn krr n-i naa nab nac nag nai nak nan nar nba nbb nbc nbg nbi nbk nbn nbr nca ncb ncc ncg nci nck ncn ncr nga ngb ngc ngg ngi ngk ngn nia nib nic nig nii nik nin nir nka nkc nki nkk nkn nkr nna nnb nnc nng nni nnk nnn nra nrb nrc nrg nri nrk nrn nrr ra- raa rab rac rag rai rak ran rar rba rbb rbc rbg rbi rbk rbn rbr rca rcb rcc rcg rci rcn rcr rga rgb rgc rgg rgi rgk rgn rgr ria rib ric rig rii rik rin rir rkb rkc rkg rkk rna rnb rnc rng rni rnn rnr rra rrb rrc rrg rri rrk rrn rrr