a-a a-b a-i a-q a-t aaa aab aai aaq aar aas aat ab- aba abb abi abq abr abs abt ai- aia aib aii aiq air ais ait aqa aqi aqr aqs aqt ar- ara arb ari arq arr ars art as- asa asb asi asq asr ass ast at- ata atb ati atr ats att baa bab bai baq bar bas bat bba bbb bbi bbq bbr bbs bbt bi- bia bib bii bir bis bit bqt bra brb bri brq brr brs brt bsa bsb bsi bsr bss bst bta btb bti btq btr bts btt ia- iaa iab iai iaq iar ias iat iba ibb ibi ibr ibs ibt iia iib iii iir iis iit iqa iqs iqt ir- ira irb iri irq irr irs irt is- isa isb isi isq isr iss ist ita itb iti itq its itt qaa qar qas qat qba qbq qbs qir qis qit qqq qra qrb qri qrs qrt qsa qsi qsr qst qta qti qtq qtr qts ra- raa rab rai raq rar ras rat rba rbb rbi rbr rbs rbt ria rib rii riq rir ris rit rqs rra rrb rri rrq rrr rrs rrt rsa rsb rsi rsq rsr rss rst rta rtb rti rtq rtr rts rtt saa sab sai saq sar sas sat sba sbb sbi sbq sbr sbs sbt sia sib sii siq sir sis sit sqa sqi sqq sqr sqs sr- sra srb sri srq srr srs srt ss- ssa ssb ssi ssq ssr sss sst sta stb sti stq str sts stt taa tab tai taq tar tas tat tba tbb tbi tbr tbs tbt tia tib tii tir tis tit tra trb tri trq trr trs trt tsa tsb tsi tsq tsr tss tst tta ttb tti ttr tts ttt