-er -ic a-a a-b a-c a-i a-t aaa aab aac aad aae aag aai aar aat ab- aba abb abc abd abe abg abi abr abt ac- aca acb acc acd ace acg aci acr act ad- ada adb adc add ade adg adi adr adt aea aeb aec aed aee aeg aei aer aet ag- aga agb agc agd age agg agi agr agt ai- aia aib aic aid aie aig aii air ait ar- ara arb arc ard are arg ari arr art at- ata atb atc atd ate atg ati atr att baa bab bac bad bae bag bai bar bat bba bbb bbc bbd bbe bbg bbi bbr bbt bca bcb bcc bcd bce bcg bci bcr bct bda bdb bdc bdd bde bdg bdi bdr bdt be- bea beb bec bed bee beg bei ber bet bga bgb bgc bgd bge bgg bgi bgr bgt bi- bia bib bic bid bie big bii bir bit bra brb brd bre brg bri brr brt bta btb btc btd bte btg bti btr btt c-- caa cab cac cad cae cag cai car cat cba cbb cbc cbd cbe cbg cbi cbr cbt cca ccb ccc ccd cce ccg cci ccr cct cda cdb cdc cdd cde cdg cdi cdr cdt ce- cea ceb cec ced cee ceg cei cer cet cga cgb cgc cgd cge cgg cgi cgr cgt ci- cia cib cic cid cie cig cii cir cit cra crb crc crd cre crg cri crr crt cta ctb ctc ctd cte ctg cti ctr ctt daa dab dac dad dae dag dai dar dat dba dbb dbc dbd dbe dbg dbi dbr dbt dca dcb dcc dcd dce dcg dci dcr dct dda ddb ddc ddd dde ddg ddi ddr ddt de- dea deb dec ded dee deg dei der det dga dgc dgd dge dgg dgi dgr dgt di- dia dib dic did die dig dii dir dit dra drb drc drd dre drg dri drr drt dta dtb dtc dtd dte dtg dti dtr dtt eaa eab eac ead eae eag eai ear eat eba ebb ebc ebd ebe ebg ebi ebr ebt ec- eca ecb ecc ecd ece ecg eci ecr ect ed- eda edb edc edd ede edg edi edr edt eea eeb eec eed eee eeg eer eet ega egb egc egd ege egg egi egr egt eia eib eic eid eie eig eii eir eit era erb erc erd ere erg eri err ert eta etb etc etd ete etg eti etr ett g-d gaa gab gac gad gae gag gai gar gat gba gbc gbd gbe gbg gbi gbr gbt gca gcb gcc gcd gce gcg gci gcr gct gda gdb gdc gdd gde gdi gdr gdt ge- gea geb gec ged gee geg gei ger get gga ggb ggc ggd ggg ggi ggr ggt gia gib gic gid gie gig gii gir git gra grb grc grd gre grg gri grr grt gta gtb gtc gtd gte gtg gti gtr gtt i-d ia- iaa iab iac iad iae iag iai iar iat iba ibb ibc ibd ibe ibg ibi ibr ibt ica icb icc icd ice icg ici icr ict ida idb idc idd ide idg idi idr idt ie- iea iec ied iee ieg iei ier iet iga igb igc igd ige igg igi igr igt iia iib iic iid iie iii iir iit ir- ira irb irc ird ire irg iri irr irt ita itb itc itd ite itg iti itt ra- raa rab rac rad rae rag rai rar rat rba rbb rbc rbd rbe rbg rbi rbr rbt rca rcb rcc rcd rce rcg rci rcr rct rda rdb rdc rdd rde rdg rdi rdr rdt re- rea reb rec red ree reg rei rer ret rga rgb rgc rgd rge rgg rgi rgr rgt ria rib ric rid rie rig rii rir rit rra rrb rrc rrd rrg rri rrr rrt rta rtb rtc rtd rte rtg rti rtr rtt taa tab tac tad tae tag tai tar tat tba tbb tbc tbd tbe tbg tbi tbr tbt tca tcb tcc tcd tce tcg tci tcr tct tda tdb tdc tdd tde tdg tdi tdr tdt te- tea teb tec ted tee teg tei ter tet tga tgb tgc tge tgg tgi tgr tgt tia tib tic tid tie tig tii tir tit tra trb trc trd tre trg tri trr trt tta ttb ttc ttd tte ttg tti ttr ttt