a-a a-b a-i a-t aaa aab aai aam aar aas aat ab- aba abb abi abm abr abs abt ai- aia aib aii aim air ais ait ama amb ami amm amr ams amt ar- ara arb ari arm arr ars art as- asa asb asi asm asr ass ast at- ata atb ati atm atr ats att baa bab bai bam bar bas bat bba bbb bbi bbm bbr bbs bbt bi- bia bib bii bim bir bis bit bma bmb bmi bmm bmr bms bmt bra brb bri brm brr brs brt bsa bsb bsi bsm bsr bss bst bta btb bti btm btr bts btt ia- iaa iab iai iam iar ias iat iba ibb ibi ibm ibr ibs ibt iia iib iii iim iir iis iit im- ima imb imi imm ims imt ir- ira irb iri irm irr irs irt is- isa isb isi ism isr iss ist ita itb iti itm its itt m-r maa mab mai mam mar mas mat mba mbb mbi mbm mbr mbs mbt mi- mia mib mii mim mir mis mit mma mmb mmi mmm mmr mms mmt mra mrb mri mrm mrr mrs mrt msa msb msi msm msr mss mst mta mtb mti mtm mtr mts mtt ra- raa rab rai ram rar ras rat rba rbb rbi rbm rbr rbs rbt ria rib rii rim rir ris rit rma rmb rmi rmm rmr rms rmt rra rrb rri rrm rrr rrs rrt rsa rsb rsi rsm rsr rss rst rta rtb rti rtm rtr rts rtt saa sab sai sam sar sas sat sba sbb sbi sbm sbr sbs sbt sia sib sii sim sir sis sit sma smb smi smm smr sms smt sr- sra srb sri srm srr srs srt ss- ssa ssb ssi ssm ssr sss sst sta stb sti stm str sts stt taa tab tai tam tar tas tat tba tbb tbi tbm tbr tbs tbt tia tib tii tim tir tis tit tma tmb tmi tmm tmr tms tmt tra trb tri trm trr trs trt tsa tsb tsi tsm tsr tss tst tta ttb tti ttm ttr tts ttt