a-a a-b a-t aaa aab aao aat aau aay ab- aba abb abo abt abu aby aoa aob aoo aot aou at- ata atb ato att atu au- aua aub auo aut ay- aya ayo ayt ayu b-u baa bab bao bat bau bay bba bbb bbo bbt bbu bby boa bob boo bot bou boy bta btb bto btt btu bty bua bub buo but buu buy by- bya byo byt byu oaa oab oao oat oau ob- oba obb obo obt obu oby oo- ooa oob ooo oot ot- ota otb oto ott otu ou- oua ouo out oya oyo taa tab tao tat tau tay tba tbb tbo tbt tbu to- toa tob too tot tou toy tta ttb tto ttt ttu tty tua tub tuo tut tuu tuy tya tyo tyt ua- uaa uab uao uat uau uay uba ubb ubo ubt ubu uby uoa uob uoo uot uta utb uto utt utu uty uua uut uuu uyo uyu yaa yab yao yat yau yay yby yob yoo yot you yoy yta yto ytt ytu yua yuo yut yuu yuy yyb yyt yyu yyy