-ic a-a a-b a-c a-i a-t aaa aab aac aag aai aan aar aat ab- aba abb abc abg abi abn abr abt ac- aca acb acc acg aci acn acr act ag- aga agb agc agg agi agn agr agt ai- aia aib aic aig aii ain air ait an- ana anb anc ang ani ann anr ant ar- ara arb arc arg ari arn arr art at- ata atb atc atg ati atn atr att baa bab bac bag bai ban bar bat bba bbb bbc bbg bbi bbn bbr bbt bca bcb bcc bcg bci bcn bcr bct bga bgb bgc bgg bgi bgn bgr bgt bi- bia bib bic big bii bin bir bit bna bnb bnc bng bni bnn bnr bnt bra brb brg bri brn brr brt bta btb btc btg bti btn btr btt c-- caa cab cac cag cai can car cat cba cbb cbc cbg cbi cbn cbr cbt cca ccb ccc ccg cci ccn ccr cct cga cgb cgc cgg cgi cgn cgr cgt ci- cia cib cic cig cii cin cir cit cn- cna cnb cnc cng cni cnn cnr cnt cra crb crc crg cri crn crr crt cta ctb ctc ctg cti ctn ctr ctt gaa gab gac gag gai gan gar gat gba gbc gbg gbi gbn gbr gbt gca gcb gcc gcg gci gcn gcr gct gga ggb ggc ggg ggi ggn ggr ggt gia gib gic gig gii gin gir git gna gnb gnc gni gnn gnr gnt gra grb grc grg gri grn grr grt gta gtb gtc gtg gti gtn gtr gtt ia- iaa iab iac iag iai ian iar iat iba ibb ibc ibg ibi ibn ibr ibt ica icb icc icg ici icn icr ict iga igb igc igg igi ign igr igt iia iib iic iii iin iir iit in- ina inb inc ing ini inn inr int ir- ira irb irc irg iri irn irr irt ita itb itc itg iti itn itt n-i naa nab nac nag nai nan nar nat nba nbb nbc nbg nbi nbn nbr nbt nca ncb ncc ncg nci ncn ncr nct nga ngb ngc ngg ngi ngn ngt nia nib nic nig nii nin nir nit nna nnb nnc nng nni nnn nnt nra nrb nrc nrg nri nrn nrr nrt nta ntb ntc ntg nti ntn ntr ntt ra- raa rab rac rag rai ran rar rat rba rbb rbc rbg rbi rbn rbr rbt rca rcb rcc rcg rci rcn rcr rct rga rgb rgc rgg rgi rgn rgr rgt ria rib ric rig rii rin rir rit rna rnb rnc rng rni rnn rnr rnt rra rrb rrc rrg rri rrn rrr rrt rta rtb rtc rtg rti rtn rtr rtt taa tab tac tag tai tan tar tat tba tbb tbc tbg tbi tbn tbr tbt tca tcb tcc tcg tci tcn tcr tct tga tgb tgc tgg tgi tgn tgr tgt tia tib tic tig tii tin tir tit tna tnb tnc tng tni tnn tnr tnt tra trb trc trg tri trn trr trt tta ttb ttc ttg tti ttn ttr ttt