a-a a-b a-i a-q a-t aaa aab aai aaq aar aat ab- aba abb abi abq abr abt ai- aia aib aii aiq air ait aqa aqi aqr aqt ar- ara arb ari arq arr art at- ata atb ati atr att baa bab bai baq bar bat bba bbb bbi bbq bbr bbt bi- bia bib bii bir bit bqt bra brb bri brq brr brt bta btb bti btq btr btt ia- iaa iab iai iaq iar iat iba ibb ibi ibr ibt iia iib iii iir iit iqa iqt ir- ira irb iri irq irr irt ita itb iti itq itt qaa qar qat qba qbq qir qit qqq qra qrb qri qrt qta qti qtq qtr ra- raa rab rai raq rar rat rba rbb rbi rbr rbt ria rib rii riq rir rit rra rrb rri rrq rrr rrt rta rtb rti rtq rtr rtt taa tab tai taq tar tat tba tbb tbi tbr tbt tia tib tii tir tit tra trb tri trq trr trt tta ttb tti ttr ttt