-er a-a a-b a-c a-t aaa aab aac aae aaj aao aar aas aat ab- aba abb abc abe abj abo abr abs abt ac- aca acb acc ace acj aco acr acs act aea aeb aec aee aej aeo aer aes aet aja ajb ajc aje ajj ajo ajr ajs ajt aoa aob aoc aoe aoj aoo aor aos aot ar- ara arb arc are arj aro arr ars art as- asa asb asc ase asj aso asr ass ast at- ata atb atc ate ato atr ats att baa bab bac bae baj bao bar bas bat bba bbb bbc bbe bbo bbr bbs bbt bca bcb bcc bce bcj bco bcr bcs bct be- bea beb bec bee beo ber bes bet bja bjc bjj bjr bjs bjt boa bob boc boe boj boo bor bos bot bra brb bre brj bro brr brs brt bsa bsb bsc bse bsj bso bsr bss bst bta btb btc bte bto btr bts btt c-- c-j caa cab cac cae caj cao car cas cat cba cbb cbc cbe cbj cbo cbr cbs cbt cca ccb ccc cce ccj cco ccr ccs cct ce- cea ceb cec cee cej ceo cer ces cet cja cjb cjc cjr cjs co- coa cob coc coe coj coo cor cos cot cra crb crc cre crj cro crr crs crt csa csb csc cse csj cso csr css cst cta ctb ctc cte cto ctr cts ctt eaa eab eac eae eaj eao ear eas eat eba ebb ebc ebe ebj ebo ebr ebs ebt ec- eca ecb ecc ece ecj eco ecr ecs ect eea eeb eec eee eeo eer ees eet eja ejc ejo ejt eo- eoa eob eoc eoe eoo eor eos eot era erb erc ere ero err ers ert es- esa esb esc ese eso esr ess est eta etb etc ete etj eto etr ets ett jaa jab jac jae jaj jao jar jas jat jba jbc jbj jbo jbr jbs jbt jca jcb jcc jce jco jcr jcs jct jea jeb jec jee jej jeo jer jes jet jja jjb jjc jjj jjr jjs joa job joc joe joj joo jor jos jot jra jrb jrc jro jrr jrs jrt jsa jsb jsc jse jsj jso jsr jss jst jta jtb jtc jte jtr jts jtt oaa oab oac oae oaj oao oar oas oat ob- oba obb obc obe obj obo obr obs obt oc- oca ocb occ ocj oco ocr ocs oct oea oeb oec oee oeo oer oes oet oja ojb ojc oje ojo ojs oo- ooa oob ooc ooo oor oos oot or- ora orb orc ore oro orr ors ort os- osa osb osc ose osj oso osr oss ost ot- ota otb otc ote oto otr ots ott ra- raa rab rac rae raj rao rar ras rat rba rbb rbc rbe rbo rbr rbs rbt rca rcb rcc rce rcj rco rcr rcs rct re- rea reb rec ree reo rer res ret rja rjc rjr roa rob roc roe roj roo ror ros rot rra rrb rrc rrr rrs rrt rsa rsb rsc rse rsj rso rsr rss rst rta rtb rtc rte rtj rto rtr rts rtt saa sab sac sae saj sao sar sas sat sba sbb sbc sbe sbj sbo sbr sbs sbt sca scb scc sce scj sco scr scs sct se- sea seb sec see sej seo ser ses set sja sjb sjc sje sjj sjr sjs sjt soa sob soc soe soj soo sor sos sot sr- sra srb src sre srj sro srr srs srt ss- ssa ssb ssc sse ssj sso ssr sss sst sta stb stc ste stj sto str sts stt taa tab tac tae taj tao tar tas tat tba tbb tbc tbe tbj tbo tbr tbs tbt tca tcb tcc tce tcj tco tcr tcs tct te- tea teb tec tee tej teo ter tes tet tjc tje tjo tjr tjs to- toa tob toc toe toj too tor tos tot tra trb trc tre tro trr trs trt tsa tsb tsc tse tsj tso tsr tss tst tta ttb ttc tte tto ttr tts ttt