-er a-a a-b a-c a-t aaa aab aac aae aaj aar aas aat ab- aba abb abc abe abj abr abs abt ac- aca acb acc ace acj acr acs act aea aeb aec aee aej aer aes aet aja ajb ajc aje ajj ajr ajs ajt ar- ara arb arc are arj arr ars art as- asa asb asc ase asj asr ass ast at- ata atb atc ate atr ats att baa bab bac bae baj bar bas bat bba bbb bbc bbe bbr bbs bbt bca bcb bcc bce bcj bcr bcs bct be- bea beb bec bee ber bes bet bja bjc bjj bjr bjs bjt bra brb bre brj brr brs brt bsa bsb bsc bse bsj bsr bss bst bta btb btc bte btr bts btt c-- c-j caa cab cac cae caj car cas cat cba cbb cbc cbe cbj cbr cbs cbt cca ccb ccc cce ccj ccr ccs cct ce- cea ceb cec cee cej cer ces cet cja cjb cjc cjr cjs cra crb crc cre crj crr crs crt csa csb csc cse csj csr css cst cta ctb ctc cte ctr cts ctt eaa eab eac eae eaj ear eas eat eba ebb ebc ebe ebj ebr ebs ebt ec- eca ecb ecc ece ecj ecr ecs ect eea eeb eec eee eer ees eet eja ejc ejt era erb erc ere err ers ert es- esa esb esc ese esr ess est eta etb etc ete etj etr ets ett jaa jab jac jae jaj jar jas jat jba jbc jbj jbr jbs jbt jca jcb jcc jce jcr jcs jct jea jeb jec jee jej jer jes jet jja jjb jjc jjj jjr jjs jra jrb jrc jrr jrs jrt jsa jsb jsc jse jsj jsr jss jst jta jtb jtc jte jtr jts jtt ra- raa rab rac rae raj rar ras rat rba rbb rbc rbe rbr rbs rbt rca rcb rcc rce rcj rcr rcs rct re- rea reb rec ree rer res ret rja rjc rjr rra rrb rrc rrr rrs rrt rsa rsb rsc rse rsj rsr rss rst rta rtb rtc rte rtj rtr rts rtt saa sab sac sae saj sar sas sat sba sbb sbc sbe sbj sbr sbs sbt sca scb scc sce scj scr scs sct se- sea seb sec see sej ser ses set sja sjb sjc sje sjj sjr sjs sjt sr- sra srb src sre srj srr srs srt ss- ssa ssb ssc sse ssj ssr sss sst sta stb stc ste stj str sts stt taa tab tac tae taj tar tas tat tba tbb tbc tbe tbj tbr tbs tbt tca tcb tcc tce tcj tcr tcs tct te- tea teb tec tee tej ter tes tet tjc tje tjr tjs tra trb trc tre trr trs trt tsa tsb tsc tse tsj tsr tss tst tta ttb ttc tte ttr tts ttt