a-a a-b a-t aaa aab aao aat aaw aay ab- aba abb abo abt abw aby aoa aob aoo aot aow at- ata atb ato att atw aw- awa awb awo awt aww awy ay- aya ayo ayt ayw baa bab bao bat baw bay bba bbb bbo bbt bbw bby boa bob boo bot bow boy bta btb bto btt btw bty bwa bwb bwo bwy by- bya byo byt oaa oab oao oat oaw ob- oba obb obo obt obw oby oo- ooa oob ooo oot oow ot- ota otb oto ott otw owa owb owo owt oww oya oyo taa tab tao tat taw tay tba tbb tbo tbt to- toa tob too tot tow toy tta ttb tto ttt ttw tty twa twb two twt tww twy tya tyo tyt waa wab wao wat waw way wba wbb wbo wbt wbw woa wob woo wot wow woy wta wtb wto wtt wtw wwa wwo wwt www wy- wya wyo wyt yaa yab yao yat yaw yay yby yob yoo yot yow yoy yta yto ytt yyb yyt yyy