a-a a-b aaa aab aao aar aaw aay ab- aba abb abo abr abw aby aoa aob aoo aor aow ar- ara arb aro arr arw ary aw- awa awb awo awr aww awy ay- aya ayo ayr ayw baa bab bao bar baw bay bba bbb bbo bbr bbw bby boa bob boo bor bow boy bra brb bro brr brw bry bwa bwb bwo bwr bwy by- bya byo byr oaa oab oao oar oaw ob- oba obb obo obr obw oby oo- ooa oob ooo oor oow or- ora orb oro orr ory owa owb owo oww oya oyo ra- raa rab rao rar raw ray rba rbb rbo rbr rbw roa rob roo ror row roy rra rrb rrr rwa rwb rwr rwy ry- rya ryo ryr ryy waa wab wao war waw way wba wbb wbo wbr wbw woa wob woo wor wow woy wr- wra wro wrr wrw wry wwa wwo www wy- wya wyo wyr yaa yab yao yar yaw yay ybr yby yob yoo yor yow yoy yra yro yyb yyy