-er -th a-a a-b a-c a-t aaa aab aac aae aag aah aar aat ab- aba abb abc abe abg abh abr abt ac- aca acb acc ace acg ach acr act aea aeb aec aee aeg aeh aer aet ag- aga agb agc age agg agh agr agt aha ahb ahc ahe ahg ahh ahr aht ar- ara arb arc are arg arh arr art at- ata atb atc ate atg ath atr att baa bab bac bae bag bah bar bat bba bbb bbc bbe bbg bbh bbr bbt bca bcb bcc bce bcg bch bcr bct be- bea beb bec bee beg beh ber bet bga bgb bgc bge bgg bgh bgr bgt bha bhb bhc bhe bhg bhh bhr bht bra brb bre brg brh brr brt bta btb btc bte btg bth btr btt c-- caa cab cac cae cag cah car cat cba cbb cbc cbe cbg cbh cbr cbt cca ccb ccc cce ccg cch ccr cct ce- cea ceb cec cee ceg ceh cer cet cga cgb cgc cge cgg cgh cgr cgt ch- cha chb chc che chg chh chr cht cra crb crc cre crg crh crr crt cta ctb ctc cte ctg cth ctr ctt eaa eab eac eae eag eah ear eat eba ebb ebc ebe ebg ebh ebr ebt ec- eca ecb ecc ece ecg ech ecr ect eea eeb eec eee eeg eer eet ega egb egc ege egg egh egr egt eha ehb ehc ehe ehg ehh ehr eht era erb erc ere erg erh err ert eta etb etc ete etg eth etr ett gaa gab gac gae gag gah gar gat gba gbc gbe gbg gbh gbr gbt gca gcb gcc gce gcg gch gcr gct ge- gea geb gec gee geg geh ger get gga ggb ggc ggg ggh ggr ggt gha ghb ghc ghe ghg ghh ghr ght gra grb grc gre grg grh grr grt gta gtb gtc gte gtg gth gtr gtt haa hab hac hae hag hah har hat hba hbb hbc hbe hbg hbh hbr hbt hca hcb hcc hce hcg hch hcr hct he- hea heb hec hee heg heh her het hga hgb hgc hge hgg hgh hgr hgt hha hhb hhc hhe hhg hhh hhr hht hr- hra hrb hrc hre hrg hrh hrr hrt hta htb htc hte htg hth htr htt ra- raa rab rac rae rag rah rar rat rba rbb rbc rbe rbg rbh rbr rbt rca rcb rcc rce rcg rch rcr rct re- rea reb rec ree reg reh rer ret rga rgb rgc rge rgg rgh rgr rgt rh- rha rhb rhc rhe rhg rhh rhr rht rra rrb rrc rrg rrh rrr rrt rta rtb rtc rte rtg rtr rtt taa tab tac tae tag tah tar tat tba tbb tbc tbe tbg tbh tbr tbt tca tcb tcc tce tcg tch tcr tct te- tea teb tec tee teg teh ter tet tga tgb tgc tge tgg tgh tgr tgt th- tha thb thc the thg thh thr tht tra trb trc tre trg trh trr trt tta ttb ttc tte ttg tth ttr ttt