a-a a-b a-i a-t aaa aab aai aam aao aar aas aat ab- aba abb abi abm abo abr abs abt ai- aia aib aii aim aio air ais ait ama amb ami amm amo amr ams amt aoa aob aoi aom aoo aor aos aot ar- ara arb ari arm aro arr ars art as- asa asb asi asm aso asr ass ast at- ata atb ati atm ato atr ats att baa bab bai bam bao bar bas bat bba bbb bbi bbm bbo bbr bbs bbt bi- bia bib bii bim bio bir bis bit bma bmb bmi bmm bmo bmr bms bmt boa bob boi bom boo bor bos bot bra brb bri brm bro brr brs brt bsa bsb bsi bsm bso bsr bss bst bta btb bti btm bto btr bts btt ia- iaa iab iai iam iao iar ias iat iba ibb ibi ibm ibo ibr ibs ibt iia iib iii iim iio iir iis iit im- ima imb imi imm imo ims imt io- ioa iob ioi iom ioo ior ios iot ir- ira irb iri irm iro irr irs irt is- isa isb isi ism iso isr iss ist ita itb iti itm ito its itt m-o m-r maa mab mai mam mao mar mas mat mba mbb mbi mbm mbo mbr mbs mbt mi- mia mib mii mim mio mir mis mit mma mmb mmi mmm mmo mmr mms mmt moa mob moi mom moo mor mos mot mra mrb mri mrm mro mrr mrs mrt msa msb msi msm mso msr mss mst mta mtb mti mtm mto mtr mts mtt o-i oaa oab oai oam oao oar oas oat ob- oba obb obi obm obo obr obs obt oia oib oii oim oio oir ois oit om- oma omb omi omm omo omr oms omt oo- ooa oob ooi oom ooo oor oos oot or- ora orb ori orm oro orr ors ort os- osa osb osi osm oso osr oss ost ot- ota otb oti otm oto otr ots ott ra- raa rab rai ram rao rar ras rat rba rbb rbi rbm rbo rbr rbs rbt ria rib rii rim rio rir ris rit rma rmb rmi rmm rmo rmr rms rmt roa rob roi rom roo ror ros rot rra rrb rri rrm rrr rrs rrt rsa rsb rsi rsm rso rsr rss rst rta rtb rti rtm rto rtr rts rtt saa sab sai sam sao sar sas sat sba sbb sbi sbm sbo sbr sbs sbt sia sib sii sim sio sir sis sit sma smb smi smm smo smr sms smt soa sob soi som soo sor sos sot sr- sra srb sri srm sro srr srs srt ss- ssa ssb ssi ssm sso ssr sss sst sta stb sti stm sto str sts stt taa tab tai tam tao tar tas tat tba tbb tbi tbm tbo tbr tbs tbt tia tib tii tim tio tir tis tit tma tmb tmi tmm tmo tmr tms tmt to- toa tob toi tom too tor tos tot tra trb tri trm tro trr trs trt tsa tsb tsi tsm tso tsr tss tst tta ttb tti ttm tto ttr tts ttt