-ic a-a a-b a-c a-i a-t aaa aab aac aag aai aan aao aar aat ab- aba abb abc abg abi abn abo abr abt ac- aca acb acc acg aci acn aco acr act ag- aga agb agc agg agi agn ago agr agt ai- aia aib aic aig aii ain aio air ait an- ana anb anc ang ani ann ano anr ant aoa aob aoc aog aoi aon aoo aor aot ar- ara arb arc arg ari arn aro arr art at- ata atb atc atg ati atn ato atr att baa bab bac bag bai ban bao bar bat bba bbb bbc bbg bbi bbn bbo bbr bbt bca bcb bcc bcg bci bcn bco bcr bct bga bgb bgc bgg bgi bgn bgo bgr bgt bi- bia bib bic big bii bin bio bir bit bna bnb bnc bng bni bnn bno bnr bnt boa bob boc bog boi bon boo bor bot bra brb brg bri brn bro brr brt bta btb btc btg bti btn bto btr btt c-- caa cab cac cag cai can cao car cat cba cbb cbc cbg cbi cbn cbo cbr cbt cca ccb ccc ccg cci ccn cco ccr cct cga cgb cgc cgg cgi cgn cgo cgr cgt ci- cia cib cic cig cii cin cio cir cit cn- cna cnb cnc cng cni cnn cno cnr cnt co- coa cob coc cog coi con coo cor cot cra crb crc crg cri crn cro crr crt cta ctb ctc ctg cti ctn cto ctr ctt gaa gab gac gag gai gan gao gar gat gba gbc gbg gbi gbn gbo gbr gbt gca gcb gcc gcg gci gcn gco gcr gct gga ggb ggc ggg ggi ggn ggo ggr ggt gia gib gic gig gii gin gio gir git gna gnb gnc gni gnn gno gnr gnt goa gob goc gog goi gon goo gor got gra grb grc grg gri grn gro grr grt gta gtb gtc gtg gti gtn gto gtr gtt ia- iaa iab iac iag iai ian iao iar iat iba ibb ibc ibg ibi ibn ibo ibr ibt ica icb icc icg ici icn ico icr ict iga igb igc igg igi ign igo igr igt iia iib iic iii iin iio iir iit in- ina inb inc ing ini inn ino inr int io- ioa iob ioc iog ioi ion ioo ior iot ir- ira irb irc irg iri irn iro irr irt ita itb itc itg iti itn ito itt n-i naa nab nac nag nai nan nao nar nat nba nbb nbc nbg nbi nbn nbo nbr nbt nca ncb ncc ncg nci ncn nco ncr nct nga ngb ngc ngg ngi ngn ngo ngt nia nib nic nig nii nin nio nir nit nna nnb nnc nng nni nnn nno nnt no- noa nob noc nog noi non noo nor not nra nrb nrc nrg nri nrn nro nrr nrt nta ntb ntc ntg nti ntn nto ntr ntt o-i oaa oab oac oag oai oan oao oar oat ob- oba obb obc obg obi obn obo obr obt oc- oca ocb occ ocg oci ocn oco ocr oct oga ogc ogg ogi ogn ogo ogt oia oib oic oii oin oio oir oit on- ona onb onc ong oni onn ono onr ont oo- ooa oob ooc oog ooi oon ooo oor oot or- ora orb orc org ori orn oro orr ort ot- ota otb otc otg oti otn oto otr ott ra- raa rab rac rag rai ran rao rar rat rba rbb rbc rbg rbi rbn rbo rbr rbt rca rcb rcc rcg rci rcn rco rcr rct rga rgb rgc rgg rgi rgn rgo rgr rgt ria rib ric rig rii rin rio rir rit rna rnb rnc rng rni rnn rno rnr rnt roa rob roc rog roi ron roo ror rot rra rrb rrc rrg rri rrn rrr rrt rta rtb rtc rtg rti rtn rto rtr rtt taa tab tac tag tai tan tao tar tat tba tbb tbc tbg tbi tbn tbo tbr tbt tca tcb tcc tcg tci tcn tco tcr tct tga tgb tgc tgg tgi tgn tgo tgr tgt tia tib tic tig tii tin tio tir tit tna tnb tnc tng tni tnn tno tnr tnt to- toa tob toc tog toi ton too tor tot tra trb trc trg tri trn tro trr trt tta ttb ttc ttg tti ttn tto ttr ttt