-ic a-a a-b a-c a-i a-t aaa aab aac aaf aag aai aan aar aat ab- aba abb abc abf abg abi abn abr abt ac- aca acb acc acf acg aci acn acr act af- afa afb afc aff afg afi afn afr aft ag- aga agb agc agf agg agi agn agr agt ai- aia aib aic aif aig aii ain air ait an- ana anb anc anf ang ani ann anr ant ar- ara arb arc arf arg ari arn arr art at- ata atb atc atf atg ati atn atr att baa bab bac baf bag bai ban bar bat bba bbb bbc bbf bbg bbi bbn bbr bbt bca bcb bcc bcf bcg bci bcn bcr bct bfa bfb bfc bff bfg bfi bfn bfr bft bga bgb bgc bgf bgg bgi bgn bgr bgt bi- bia bib bic bif big bii bin bir bit bna bnb bnc bnf bng bni bnn bnr bnt bra brb brf brg bri brn brr brt bta btb btc btf btg bti btn btr btt c-- caa cab cac caf cag cai can car cat cba cbb cbc cbf cbg cbi cbn cbr cbt cca ccb ccc ccf ccg cci ccn ccr cct cfa cfb cfc cff cfg cfi cfn cfr cft cga cgb cgc cgg cgi cgn cgr cgt ci- cia cib cic cif cig cii cin cir cit cn- cna cnb cnc cnf cng cni cnn cnr cnt cra crb crc crf crg cri crn crr crt cta ctb ctc ctf ctg cti ctn ctr ctt faa fab fac faf fag fai fan far fat fba fbb fbc fbf fbg fbi fbn fbr fbt fca fcb fcc fcf fcg fci fcn fcr fct ffa ffc fff ffg ffi ffn ffr fft fga fgb fgc fgf fgg fgi fgn fgr fgt fia fib fic fif fig fii fin fir fit fna fnb fnc fnf fng fni fnn fnr fnt fra frb frc frf frg fri frn frr frt fta ftb ftc ftf ftg fti ftn ftr ftt gaa gab gac gaf gag gai gan gar gat gba gbc gbf gbg gbi gbn gbr gbt gca gcb gcc gcf gcg gci gcn gcr gct gfa gfb gfc gff gfi gfr gft gga ggb ggc ggg ggi ggn ggr ggt gia gib gic gif gig gii gin gir git gna gnb gnc gnf gni gnn gnr gnt gra grb grc grf grg gri grn grr grt gta gtb gtc gtf gtg gti gtn gtr gtt i-f ia- iaa iab iac iaf iag iai ian iar iat iba ibb ibc ibf ibg ibi ibn ibr ibt ica icb icc icf icg ici icn icr ict ifa ifb ifc iff ifg ifi ifn ifr ift iga igb igc igf igg igi ign igr igt iia iib iic iif iii iin iir iit in- ina inb inc inf ing ini inn inr int ir- ira irb irc irf irg iri irn irr irt ita itb itc itf itg iti itn itt n-i naa nab nac naf nag nai nan nar nat nba nbb nbc nbf nbg nbi nbn nbr nbt nca ncb ncc ncf ncg nci ncn ncr nct nfa nfb nfc nff nfi nfn nfr nft nga ngb ngc ngf ngg ngi ngn ngt nia nib nic nif nig nii nin nir nit nna nnb nnc nnf nng nni nnn nnt nra nrb nrc nrf nrg nri nrn nrr nrt nta ntb ntc ntf ntg nti ntn ntr ntt ra- raa rab rac raf rag rai ran rar rat rba rbb rbc rbf rbg rbi rbn rbr rbt rca rcb rcc rcf rcg rci rcn rcr rct rfa rfb rfc rff rfg rfi rfn rfr rft rga rgb rgc rgf rgg rgi rgn rgr rgt ria rib ric rif rig rii rin rir rit rna rnb rnc rng rni rnn rnr rnt rra rrb rrc rrf rrg rri rrn rrr rrt rta rtb rtc rtf rtg rti rtn rtr rtt taa tab tac taf tag tai tan tar tat tba tbb tbc tbf tbg tbi tbn tbr tbt tca tcb tcc tcf tcg tci tcn tcr tct tfa tfb tfc tff tfg tfi tfn tfr tft tga tgb tgc tgf tgg tgi tgn tgr tgt tia tib tic tif tig tii tin tir tit tna tnb tnc tnf tng tni tnn tnr tnt tra trb trc trf trg tri trn trr trt tta ttb ttc ttf ttg tti ttn ttr ttt