-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aag aai aan aar aat ab- aba abb abc abe abg abi abn abr abt ac- aca acb acc ace acg aci acn acr act aea aeb aec aee aeg aei aen aer aet ag- aga agb agc age agg agi agn agr agt ai- aia aib aic aie aig aii ain air ait an- ana anb anc ane ang ani ann anr ant ar- ara arb arc are arg ari arn arr art at- ata atb atc ate atg ati atn atr att baa bab bac bae bag bai ban bar bat bba bbb bbc bbe bbg bbi bbn bbr bbt bca bcb bcc bce bcg bci bcn bcr bct be- bea beb bec bee beg bei ben ber bet bga bgb bgc bge bgg bgi bgn bgr bgt bi- bia bib bic bie big bii bin bir bit bna bnb bnc bne bng bni bnn bnr bnt bra brb bre brg bri brn brr brt bta btb btc bte btg bti btn btr btt c-- caa cab cac cae cag cai can car cat cba cbb cbc cbe cbg cbi cbn cbr cbt cca ccb ccc cce ccg cci ccn ccr cct ce- cea ceb cec cee ceg cei cen cer cet cga cgb cgc cge cgg cgi cgn cgr cgt ci- cia cib cic cie cig cii cin cir cit cn- cna cnb cnc cne cng cni cnn cnr cnt cra crb crc cre crg cri crn crr crt cta ctb ctc cte ctg cti ctn ctr ctt eaa eab eac eae eag eai ean ear eat eba ebb ebc ebe ebg ebi ebn ebr ebt ec- eca ecb ecc ece ecg eci ecn ecr ect eea eeb eec eee eeg een eer eet ega egb egc ege egg egi egn egr egt eia eib eic eie eig eii ein eir eit en- ena enb enc ene eng eni enn enr ent era erb erc ere erg eri ern err ert eta etb etc ete etg eti etn etr ett gaa gab gac gae gag gai gan gar gat gba gbc gbe gbg gbi gbn gbr gbt gca gcb gcc gce gcg gci gcn gcr gct ge- gea geb gec gee geg gei gen ger get gga ggb ggc ggg ggi ggn ggr ggt gia gib gic gie gig gii gin gir git gna gnb gnc gne gni gnn gnr gnt gra grb grc gre grg gri grn grr grt gta gtb gtc gte gtg gti gtn gtr gtt ia- iaa iab iac iae iag iai ian iar iat iba ibb ibc ibe ibg ibi ibn ibr ibt ica icb icc ice icg ici icn icr ict ie- iea iec iee ieg iei ien ier iet iga igb igc ige igg igi ign igr igt iia iib iic iie iii iin iir iit in- ina inb inc ine ing ini inn inr int ir- ira irb irc ire irg iri irn irr irt ita itb itc ite itg iti itn itt n-i naa nab nac nae nag nai nan nar nat nba nbb nbc nbe nbg nbi nbn nbr nbt nca ncb ncc nce ncg nci ncn ncr nct ne- nea neb nec nee neg nei nen ner net nga ngb ngc nge ngg ngi ngn ngt nia nib nic nie nig nii nin nir nit nna nnb nnc nne nng nni nnn nnt nra nrb nrc nre nrg nri nrn nrr nrt nta ntb ntc nte ntg nti ntn ntr ntt ra- raa rab rac rae rag rai ran rar rat rba rbb rbc rbe rbg rbi rbn rbr rbt rca rcb rcc rce rcg rci rcn rcr rct re- rea reb rec ree reg rei ren rer ret rga rgb rgc rge rgg rgi rgn rgr rgt ria rib ric rie rig rii rin rir rit rna rnb rnc rng rni rnn rnr rnt rra rrb rrc rrg rri rrn rrr rrt rta rtb rtc rte rtg rti rtn rtr rtt taa tab tac tae tag tai tan tar tat tba tbb tbc tbe tbg tbi tbn tbr tbt tca tcb tcc tce tcg tci tcn tcr tct te- tea teb tec tee teg tei ten ter tet tga tgb tgc tge tgg tgi tgn tgr tgt tia tib tic tie tig tii tin tir tit tna tnb tnc tne tng tni tnn tnr tnt tra trb trc tre trg tri trn trr trt tta ttb ttc tte ttg tti ttn ttr ttt