a-a a-b a-i a-t aaa aab aai aam aao aar aas aat aax ab- aba abb abi abm abo abr abs abt abx ai- aia aib aii aim aio air ais ait aix ama amb ami amm amo amr ams amt amx aoa aob aoi aom aoo aor aos aot aox ar- ara arb ari arm aro arr ars art arx as- asa asb asi asm aso asr ass ast asx at- ata atb ati atm ato atr ats att atx ax- axa axi axm axo axr axs axt axx baa bab bai bam bao bar bas bat bax bba bbb bbi bbm bbo bbr bbs bbt bbx bi- bia bib bii bim bio bir bis bit bix bma bmb bmi bmm bmo bmr bms bmt bmx boa bob boi bom boo bor bos bot box bra brb bri brm bro brr brs brt brx bsa bsb bsi bsm bso bsr bss bst bsx bta btb bti btm bto btr bts btt btx bxb bxi bxm bxo bxx ia- iaa iab iai iam iao iar ias iat iba ibb ibi ibm ibo ibr ibs ibt ibx iia iib iii iim iio iir iis iit iix im- ima imb imi imm imo ims imt imx io- ioa iob ioi iom ioo ior ios iot ir- ira irb iri irm iro irr irs irt irx is- isa isb isi ism iso isr iss ist ita itb iti itm ito its itt itx ixi m-o m-r maa mab mai mam mao mar mas mat max mba mbb mbi mbm mbo mbr mbs mbt mbx mi- mia mib mii mim mio mir mis mit mix mma mmb mmi mmm mmo mmr mms mmt mmx moa mob moi mom moo mor mos mot mox mra mrb mri mrm mro mrr mrs mrt mrx msa msb msi msm mso msr mss mst msx mta mtb mti mtm mto mtr mts mtt mtx mxa mxi mxr mxs o-i oaa oab oai oam oao oar oas oat oax ob- oba obb obi obm obo obr obs obt obx oia oib oii oim oio oir ois oit om- oma omb omi omm omo omr oms omt omx oo- ooa oob ooi oom ooo oor oos oot oox or- ora orb ori orm oro orr ors ort orx os- osa osb osi osm oso osr oss ost osx ot- ota otb oti otm oto otr ots ott ox- oxa oxb oxi oxo oxt oxx ra- raa rab rai ram rao rar ras rat rax rba rbb rbi rbm rbo rbr rbs rbt rbx ria rib rii rim rio rir ris rit rix rma rmb rmi rmm rmo rmr rms rmt rmx roa rob roi rom roo ror ros rot rox rra rrb rri rrm rrr rrs rrt rsa rsb rsi rsm rso rsr rss rst rsx rta rtb rti rtm rto rtr rts rtt rtx rxr rxs saa sab sai sam sao sar sas sat sax sba sbb sbi sbm sbo sbr sbs sbt sbx sia sib sii sim sio sir sis sit six sma smb smi smm smo smr sms smt smx soa sob soi som soo sor sos sot sox sr- sra srb sri srm sro srr srs srt srx ss- ssa ssb ssi ssm sso ssr sss sst ssx sta stb sti stm sto str sts stt stx sxi sxm sxs sxt t-x taa tab tai tam tao tar tas tat tax tba tbb tbi tbm tbo tbr tbs tbt tia tib tii tim tio tir tis tit tix tma tmb tmi tmm tmo tmr tms tmt tmx to- toa tob toi tom too tor tos tot tox tra trb tri trm tro trr trs trt trx tsa tsb tsi tsm tso tsr tss tst tsx tta ttb tti ttm tto ttr tts ttt ttx txi txs txt xaa xam xar xas xat xbr xbx xia xii xio xis xit xix xma xmi xmm xmo xmr xms xmt xmx xoa xoi xom xoo xor xos xot xox xrt xrx xsa xsb xsi xsm xss xst xti xtm xtr xts xtx xxi xxo xxx