a-a a-b aaa aab aao aas aaw aay ab- aba abb abo abs abw aby aoa aob aoo aos aow as- asa asb aso ass asw asy aw- awa awb awo aws aww awy ay- aya ayo ays ayw baa bab bao bas baw bay bba bbb bbo bbs bbw bby boa bob boo bos bow boy bsa bsb bso bss bsw bsy bwa bwb bwo bws bwy by- bya byo bys oaa oab oao oas oaw ob- oba obb obo obs obw oby oo- ooa oob ooo oos oow os- osa osb oso oss osw owa owb owo ows oww oya oyo oys saa sab sao sas saw say sba sbb sbo sbs sbw sby soa sob soo sos sow soy ss- ssa ssb sso sss ssw swa swb swo sws swy sy- sya syb sys waa wab wao was waw way wba wbb wbo wbs wbw woa wob woo wos wow woy wsa wsb wso wss wsw wwa wwo www wy- wya wyo wys yaa yab yao yas yaw yay ybs yby yob yoo yos yow yoy ysa ysb yso yss ysy yyb yys yyy