a-a a-b a-i a-q aaa aab aai aaq aar aas ab- aba abb abi abq abr abs ai- aia aib aii aiq air ais aqa aqi aqr aqs ar- ara arb ari arq arr ars as- asa asb asi asq asr ass baa bab bai baq bar bas bba bbb bbi bbq bbr bbs bi- bia bib bii bir bis bra brb bri brq brr brs bsa bsb bsi bsr bss ia- iaa iab iai iaq iar ias iba ibb ibi ibr ibs iia iib iii iir iis iqa iqs ir- ira irb iri irq irr irs is- isa isb isi isq isr iss qaa qar qas qba qbq qbs qir qis qqq qra qrb qri qrs qsa qsi qsr ra- raa rab rai raq rar ras rba rbb rbi rbr rbs ria rib rii riq rir ris rqs rra rrb rri rrq rrr rrs rsa rsb rsi rsq rsr rss saa sab sai saq sar sas sba sbb sbi sbq sbr sbs sia sib sii siq sir sis sqa sqi sqq sqr sqs sr- sra srb sri srq srr srs ss- ssa ssb ssi ssq ssr sss