a-a a-b a-t aaa aab aao aar aat aau aay ab- aba abb abo abr abt abu aby aoa aob aoo aor aot aou ar- ara arb aro arr art aru ary at- ata atb ato atr att atu au- aua aub auo aur aut ay- aya ayo ayr ayt ayu b-u baa bab bao bar bat bau bay bba bbb bbo bbr bbt bbu bby boa bob boo bor bot bou boy bra brb bro brr brt bru bry bta btb bto btr btt btu bty bua bub buo bur but buu buy by- bya byo byr byt byu oaa oab oao oar oat oau ob- oba obb obo obr obt obu oby oo- ooa oob ooo oor oot or- ora orb oro orr ort oru ory ot- ota otb oto otr ott otu ou- oua ouo our out oya oyo ra- raa rab rao rar rat rau ray rba rbb rbo rbr rbt rbu roa rob roo ror rot rou roy rra rrb rrr rrt rru rta rtb rto rtr rtt rtu rty rua rub ruo rur rut ruu ruy ry- rya ryo ryr ryu ryy taa tab tao tar tat tau tay tba tbb tbo tbr tbt tbu to- toa tob too tor tot tou toy tra trb tro trr trt tru try tta ttb tto ttr ttt ttu tty tua tub tuo tur tut tuu tuy tya tyo tyr tyt ua- uaa uab uao uar uat uau uay uba ubb ubo ubr ubt ubu uby uoa uob uoo uor uot ur- ura urb uro urr urt uru ury uta utb uto utr utt utu uty uua uur uut uuu uyo uyu yaa yab yao yar yat yau yay ybr yby yob yoo yor yot you yoy yra yro yrt yru yta yto ytr ytt ytu yua yuo yur yut yuu yuy yyb yyt yyu yyy