-ey a-a a-b a-c aaa aab aac aae aao aav aay ab- aba abb abc abe abo abv aby ac- aca acb acc ace aco acv acy aea aeb aec aee aeo aev aey aoa aob aoc aoe aoo aov av- ava avb avc ave avo avy ay- aya ayc aye ayo baa bab bac bae bao bav bay bba bbb bbc bbe bbo bby bca bcb bcc bce bco bcv bcy be- bea beb bec bee beo bev bey boa bob boc boe boo bov boy bva bvb bvc bve bvo bvv by- bya byc bye byo c-- caa cab cac cae cao cav cay cba cbb cbc cbe cbo cbv cby cca ccb ccc cce cco ccv ce- cea ceb cec cee ceo cev cey co- coa cob coc coe coo cov coy cva cvb cvc cve cvo cvv cya cyb cyc cye cyo eaa eab eac eae eao eav eba ebb ebc ebe ebo ebv eby ec- eca ecb ecc ece eco ecv eea eeb eec eee eeo eev eey eo- eoa eob eoc eoe eoo eva evb evc eve evo evv evy eya eyc eye eyo oaa oab oac oae oao oav ob- oba obb obc obe obo obv oby oc- oca ocb occ oco ocv oea oeb oec oee oeo oey oo- ooa oob ooc ooo oov ov- ova ovb ovc ove ovo ovv oya oye oyo v-a v-e vaa vab vac vae vao vav vay vba vbc vbo vbv vca vcc vce vco vcy vea veb vec vee veo vey voa vob voc voe voo vov voy vva vvb vvc vvo vvv vye yaa yab yac yae yao yav yay ybc ybe yby yca ycc yce yco ycv ycy yea yeb yec yee yeo yev yey yob yoc yoe yoo yoy yva yve yvo yvy yyb yyc yye yyy