a-a a-b a-i a-q aaa aab aai aaq aar ab- aba abb abi abq abr ai- aia aib aii aiq air aqa aqi aqr ar- ara arb ari arq arr baa bab bai baq bar bba bbb bbi bbq bbr bi- bia bib bii bir bra brb bri brq brr ia- iaa iab iai iaq iar iba ibb ibi ibr iia iib iii iir iqa ir- ira irb iri irq irr qaa qar qba qbq qir qqq qra qrb qri ra- raa rab rai raq rar rba rbb rbi rbr ria rib rii riq rir rra rrb rri rrq rrr