-ic a-a a-b a-c a-i aaa aab aac aaf aag aai aak aan aar ab- aba abb abc abf abg abi abk abn abr ac- aca acb acc acf acg aci ack acn acr af- afa afb afc aff afg afi afk afn afr ag- aga agb agc agf agg agi agk agn agr ai- aia aib aic aif aig aii aik ain air aka akb akc akg aki akk akn akr an- ana anb anc anf ang ani ank ann anr ar- ara arb arc arf arg ari ark arn arr baa bab bac baf bag bai bak ban bar bba bbb bbc bbf bbg bbi bbk bbn bbr bca bcb bcc bcf bcg bci bck bcn bcr bfa bfb bfc bff bfg bfi bfn bfr bga bgb bgc bgf bgg bgi bgk bgn bgr bi- bia bib bic bif big bii bik bin bir bka bkb bkc bkf bkg bkk bkn bkr bna bnb bnc bnf bng bni bnk bnn bnr bra brb brf brg bri brk brn brr c-- caa cab cac caf cag cai cak can car cba cbb cbc cbf cbg cbi cbk cbn cbr cca ccb ccc ccf ccg cci cck ccn ccr cfa cfb cfc cff cfg cfi cfk cfn cfr cga cgb cgc cgg cgi cgn cgr ci- cia cib cic cif cig cii cik cin cir cka ckb ckc cki cn- cna cnb cnc cnf cng cni cnn cnr cra crb crc crf crg cri crk crn crr faa fab fac faf fag fai fak fan far fba fbb fbc fbf fbg fbi fbk fbn fbr fca fcb fcc fcf fcg fci fck fcn fcr ffa ffc fff ffg ffi ffk ffn ffr fga fgb fgc fgf fgg fgi fgn fgr fia fib fic fif fig fii fik fin fir fka fkb fkc fkf fkg fki fkk fna fnb fnc fnf fng fni fnk fnn fnr fra frb frc frf frg fri frk frn frr gaa gab gac gaf gag gai gak gan gar gba gbc gbf gbg gbi gbk gbn gbr gca gcb gcc gcf gcg gci gck gcn gcr gfa gfb gfc gff gfi gfk gfr gga ggb ggc ggg ggi ggn ggr gia gib gic gif gig gii gik gin gir gka gkb gkn gna gnb gnc gnf gni gnn gnr gra grb grc grf grg gri grk grn grr i-f ia- iaa iab iac iaf iag iai ian iar iba ibb ibc ibf ibg ibi ibk ibn ibr ica icb icc icf icg ici ick icn icr ifa ifb ifc iff ifg ifi ifn ifr iga igb igc igf igg igi igk ign igr iia iib iic iif iii iin iir ika ikb ikc ikf iki ikk ikr in- ina inb inc inf ing ini ink inn inr ir- ira irb irc irf irg iri irk irn irr ka- kaa kab kac kaf kag kai kak kan kar kba kbb kbc kbf kbi kbk kbn kbr kca kcb kcc kcg kci kck kcn kcr kfa kfc kff kfg kfi kga kgb kgc kgf kgi kia kib kic kif kig kii kik kin kir kkb kkc kki kkk kkn kkr kn- kna knc knf kng kni knk knn knr kra krc krf krg kri krk krn krr n-i naa nab nac naf nag nai nak nan nar nba nbb nbc nbf nbg nbi nbk nbn nbr nca ncb ncc ncf ncg nci nck ncn ncr nfa nfb nfc nff nfi nfk nfn nfr nga ngb ngc ngf ngg ngi ngk ngn nia nib nic nif nig nii nik nin nir nka nkc nkf nki nkk nkn nkr nna nnb nnc nnf nng nni nnk nnn nra nrb nrc nrf nrg nri nrk nrn nrr ra- raa rab rac raf rag rai rak ran rar rba rbb rbc rbf rbg rbi rbk rbn rbr rca rcb rcc rcf rcg rci rcn rcr rfa rfb rfc rff rfg rfi rfk rfn rfr rga rgb rgc rgf rgg rgi rgk rgn rgr ria rib ric rif rig rii rik rin rir rkb rkc rkf rkg rkk rna rnb rnc rng rni rnn rnr rra rrb rrc rrf rrg rri rrk rrn rrr