-ey a-a a-b a-t aaa aab aae aao aat aav aay ab- aba abb abe abo abt abv aby aea aeb aee aeo aet aev aey aoa aob aoe aoo aot aov at- ata atb ate ato att atv av- ava avb ave avo avt avy ay- aya aye ayo ayt baa bab bae bao bat bav bay bba bbb bbe bbo bbt bby be- bea beb bee beo bet bev bey boa bob boe boo bot bov boy bta btb bte bto btt btv bty bva bvb bve bvo bvt bvv by- bya bye byo byt eaa eab eae eao eat eav eba ebb ebe ebo ebt ebv eby eea eeb eee eeo eet eev eey eo- eoa eob eoe eoo eot eta etb ete eto ett etv ety eva evb eve evo evt evv evy eya eye eyo eyt oaa oab oae oao oat oav ob- oba obb obe obo obt obv oby oea oeb oee oeo oet oey oo- ooa oob ooo oot oov ot- ota otb ote oto ott otv ov- ova ovb ove ovo ovv oya oye oyo taa tab tae tao tat tav tay tba tbb tbe tbo tbt tbv te- tea teb tee teo tet tev tey to- toa tob toe too tot tov toy tta ttb tte tto ttt ttv tty tva tvb tve tvo tvt tvy tya tye tyo tyt v-a v-e vaa vab vae vao vat vav vay vba vbo vbv vea veb vee veo vet vey voa vob voe voo vot vov voy vta vtb vte vto vtt vtv vty vva vvb vvo vvt vvv vye vyt yaa yab yae yao yat yav yay ybe yby yea yeb yee yeo yet yev yey yob yoe yoo yot yoy yta yte yto ytt ytv yva yve yvo yvy yyb yye yyt yyy