a-a a-b a-t aaa aab aam aao aar aas aat aax ab- aba abb abm abo abr abs abt abx ama amb amm amo amr ams amt amx aoa aob aom aoo aor aos aot aox ar- ara arb arm aro arr ars art arx as- asa asb asm aso asr ass ast asx at- ata atb atm ato atr ats att atx ax- axa axm axo axr axs axt axx baa bab bam bao bar bas bat bax bba bbb bbm bbo bbr bbs bbt bbx bma bmb bmm bmo bmr bms bmt bmx boa bob bom boo bor bos bot box bra brb brm bro brr brs brt brx bsa bsb bsm bso bsr bss bst bsx bta btb btm bto btr bts btt btx bxb bxm bxo bxx m-o m-r maa mab mam mao mar mas mat max mba mbb mbm mbo mbr mbs mbt mbx mma mmb mmm mmo mmr mms mmt mmx moa mob mom moo mor mos mot mox mra mrb mrm mro mrr mrs mrt mrx msa msb msm mso msr mss mst msx mta mtb mtm mto mtr mts mtt mtx mxa mxr mxs oaa oab oam oao oar oas oat oax ob- oba obb obm obo obr obs obt obx om- oma omb omm omo omr oms omt omx oo- ooa oob oom ooo oor oos oot oox or- ora orb orm oro orr ors ort orx os- osa osb osm oso osr oss ost osx ot- ota otb otm oto otr ots ott ox- oxa oxb oxo oxt oxx ra- raa rab ram rao rar ras rat rax rba rbb rbm rbo rbr rbs rbt rbx rma rmb rmm rmo rmr rms rmt rmx roa rob rom roo ror ros rot rox rra rrb rrm rrr rrs rrt rsa rsb rsm rso rsr rss rst rsx rta rtb rtm rto rtr rts rtt rtx rxr rxs saa sab sam sao sar sas sat sax sba sbb sbm sbo sbr sbs sbt sbx sma smb smm smo smr sms smt smx soa sob som soo sor sos sot sox sr- sra srb srm sro srr srs srt srx ss- ssa ssb ssm sso ssr sss sst ssx sta stb stm sto str sts stt stx sxm sxs sxt t-x taa tab tam tao tar tas tat tax tba tbb tbm tbo tbr tbs tbt tma tmb tmm tmo tmr tms tmt tmx to- toa tob tom too tor tos tot tox tra trb trm tro trr trs trt trx tsa tsb tsm tso tsr tss tst tsx tta ttb ttm tto ttr tts ttt ttx txs txt xaa xam xar xas xat xbr xbx xma xmm xmo xmr xms xmt xmx xoa xom xoo xor xos xot xox xrt xrx xsa xsb xsm xss xst xtm xtr xts xtx xxo xxx