a-a a-b a-c a-t aaa aab aac aaj aao aar aas aat ab- aba abb abc abj abo abr abs abt ac- aca acb acc acj aco acr acs act aja ajb ajc ajj ajo ajr ajs ajt aoa aob aoc aoj aoo aor aos aot ar- ara arb arc arj aro arr ars art as- asa asb asc asj aso asr ass ast at- ata atb atc ato atr ats att baa bab bac baj bao bar bas bat bba bbb bbc bbo bbr bbs bbt bca bcb bcc bcj bco bcr bcs bct bja bjc bjj bjr bjs bjt boa bob boc boj boo bor bos bot bra brb brj bro brr brs brt bsa bsb bsc bsj bso bsr bss bst bta btb btc bto btr bts btt c-- c-j caa cab cac caj cao car cas cat cba cbb cbc cbj cbo cbr cbs cbt cca ccb ccc ccj cco ccr ccs cct cja cjb cjc cjr cjs co- coa cob coc coj coo cor cos cot cra crb crc crj cro crr crs crt csa csb csc csj cso csr css cst cta ctb ctc cto ctr cts ctt jaa jab jac jaj jao jar jas jat jba jbc jbj jbo jbr jbs jbt jca jcb jcc jco jcr jcs jct jja jjb jjc jjj jjr jjs joa job joc joj joo jor jos jot jra jrb jrc jro jrr jrs jrt jsa jsb jsc jsj jso jsr jss jst jta jtb jtc jtr jts jtt oaa oab oac oaj oao oar oas oat ob- oba obb obc obj obo obr obs obt oc- oca ocb occ ocj oco ocr ocs oct oja ojb ojc ojo ojs oo- ooa oob ooc ooo oor oos oot or- ora orb orc oro orr ors ort os- osa osb osc osj oso osr oss ost ot- ota otb otc oto otr ots ott ra- raa rab rac raj rao rar ras rat rba rbb rbc rbo rbr rbs rbt rca rcb rcc rcj rco rcr rcs rct rja rjc rjr roa rob roc roj roo ror ros rot rra rrb rrc rrr rrs rrt rsa rsb rsc rsj rso rsr rss rst rta rtb rtc rtj rto rtr rts rtt saa sab sac saj sao sar sas sat sba sbb sbc sbj sbo sbr sbs sbt sca scb scc scj sco scr scs sct sja sjb sjc sjj sjr sjs sjt soa sob soc soj soo sor sos sot sr- sra srb src srj sro srr srs srt ss- ssa ssb ssc ssj sso ssr sss sst sta stb stc stj sto str sts stt taa tab tac taj tao tar tas tat tba tbb tbc tbj tbo tbr tbs tbt tca tcb tcc tcj tco tcr tcs tct tjc tjo tjr tjs to- toa tob toc toj too tor tos tot tra trb trc tro trr trs trt tsa tsb tsc tsj tso tsr tss tst tta ttb ttc tto ttr tts ttt