-er -th a-a a-b a-c a-t aaa aab aac aae aah aao aar aas aat ab- aba abb abc abe abh abo abr abs abt ac- aca acb acc ace ach aco acr acs act aea aeb aec aee aeh aeo aer aes aet aha ahb ahc ahe ahh aho ahr ahs aht aoa aob aoc aoe aoh aoo aor aos aot ar- ara arb arc are arh aro arr ars art as- asa asb asc ase ash aso asr ass ast at- ata atb atc ate ath ato atr ats att baa bab bac bae bah bao bar bas bat bba bbb bbc bbe bbh bbo bbr bbs bbt bca bcb bcc bce bch bco bcr bcs bct be- bea beb bec bee beh beo ber bes bet bha bhb bhc bhe bhh bho bhr bhs bht boa bob boc boe boh boo bor bos bot bra brb bre brh bro brr brs brt bsa bsb bsc bse bsh bso bsr bss bst bta btb btc bte bth bto btr bts btt c-- caa cab cac cae cah cao car cas cat cba cbb cbc cbe cbh cbo cbr cbs cbt cca ccb ccc cce cch cco ccr ccs cct ce- cea ceb cec cee ceh ceo cer ces cet ch- cha chb chc che chh cho chr chs cht co- coa cob coc coe coh coo cor cos cot cra crb crc cre crh cro crr crs crt csa csb csc cse csh cso csr css cst cta ctb ctc cte cth cto ctr cts ctt eaa eab eac eae eah eao ear eas eat eba ebb ebc ebe ebh ebo ebr ebs ebt ec- eca ecb ecc ece ech eco ecr ecs ect eea eeb eec eee eeo eer ees eet eha ehb ehc ehe ehh eho ehr ehs eht eo- eoa eob eoc eoe eoh eoo eor eos eot era erb erc ere erh ero err ers ert es- esa esb esc ese esh eso esr ess est eta etb etc ete eth eto etr ets ett haa hab hac hae hah hao har has hat hba hbb hbc hbe hbh hbo hbr hbs hbt hca hcb hcc hce hch hco hcr hcs hct he- hea heb hec hee heh heo her hes het hha hhb hhc hhe hhh hho hhr hhs hht hoa hob hoc hoe hoh hoo hor hos hot hr- hra hrb hrc hre hrh hro hrr hrs hrt hsa hsb hsc hse hsh hsr hss hst hta htb htc hte hth hto htr hts htt oaa oab oac oae oah oao oar oas oat ob- oba obb obc obe obh obo obr obs obt oc- oca ocb occ och oco ocr ocs oct oea oeb oec oee oeh oeo oer oes oet oha ohc ohe ohh oho ohr ohs oht oo- ooa oob ooc ooh ooo oor oos oot or- ora orb orc ore orh oro orr ors ort os- osa osb osc ose osh oso osr oss ost ot- ota otb otc ote oth oto otr ots ott ra- raa rab rac rae rah rao rar ras rat rba rbb rbc rbe rbh rbo rbr rbs rbt rca rcb rcc rce rch rco rcr rcs rct re- rea reb rec ree reh reo rer res ret rh- rha rhb rhc rhe rhh rho rhr rhs rht roa rob roc roe roh roo ror ros rot rra rrb rrc rrh rrr rrs rrt rsa rsb rsc rse rsh rso rsr rss rst rta rtb rtc rte rto rtr rts rtt saa sab sac sae sah sao sar sas sat sba sbb sbc sbe sbh sbo sbr sbs sbt sca scb scc sce sch sco scr scs sct se- sea seb sec see seh seo ser ses set sh- sha shb shc she shh sho shr shs sht soa sob soc soe soh soo sor sos sot sr- sra srb src sre srh sro srr srs srt ss- ssa ssb ssc sse ssh sso ssr sss sst sta stb stc ste sth sto str sts stt taa tab tac tae tah tao tar tas tat tba tbb tbc tbe tbh tbo tbr tbs tbt tca tcb tcc tce tch tco tcr tcs tct te- tea teb tec tee teh teo ter tes tet th- tha thb thc the thh tho thr ths tht to- toa tob toc toe toh too tor tos tot tra trb trc tre trh tro trr trs trt tsa tsb tsc tse tsh tso tsr tss tst tta ttb ttc tte tth tto ttr tts ttt