-ey a-a a-b a-c aaa aab aac aae aak aan aao aay ab- aba abb abc abe abk abn abo aby ac- aca acb acc ace ack acn aco acy aea aeb aec aee aek aen aeo aey aka akb akc ake akk akn ako an- ana anb anc ane ank ann ano any aoa aob aoc aoe aok aon aoo ay- aya ayc aye ayk ayn ayo baa bab bac bae bak ban bao bay bba bbb bbc bbe bbk bbn bbo bby bca bcb bcc bce bck bcn bco bcy be- bea beb bec bee bek ben beo bey bka bkb bkc bke bkk bkn bko bna bnb bnc bne bnk bnn bno boa bob boc boe bok bon boo boy by- bya byc bye byk byn byo c-- caa cab cac cae cak can cao cay cba cbb cbc cbe cbk cbn cbo cby cca ccb ccc cce cck ccn cco ce- cea ceb cec cee cek cen ceo cey cka ckb ckc cko cky cn- cna cnb cnc cne cnn cno cny co- coa cob coc coe cok con coo coy cya cyb cyc cye cyk cyn cyo eaa eab eac eae eak ean eao eba ebb ebc ebe ebk ebn ebo eby ec- eca ecb ecc ece eck ecn eco eea eeb eec eee eek een eeo eey eka ekb ekc eke eko eky en- ena enb enc ene enk enn eno eny eo- eoa eob eoc eoe eok eon eoo eya eyc eye eyn eyo ka- kaa kab kac kae kak kan kao kay kba kbb kbc kbe kbk kbn kbo kca kcb kcc kce kck kcn ke- kea keb kec kee kek ken keo key kkb kkc kke kkk kkn kky kn- kna knc kne knk knn kno koa kob koc koe kok kon koo koy kya kyc kye kyn kyo naa nab nac nae nak nan nao nay nba nbb nbc nbe nbk nbn nbo nca ncb ncc nce nck ncn nco ne- nea neb nec nee nek nen neo ney nka nkc nke nkk nkn nko nky nna nnb nnc nne nnk nnn nno no- noa nob noc noe nok non noo noy nya nyc nye nyk nyn nyo nyy oaa oab oac oae oak oan oao ob- oba obb obc obe obk obn obo oby oc- oca ocb occ ock ocn oco oea oeb oec oee oen oeo oey oka okb okc oke okk oko on- ona onb onc one onk onn ono ony oo- ooa oob ooc ook oon ooo oya oye oyo yaa yab yac yae yak yan yao yay ybc ybe yby yca ycc yce yco ycy yea yeb yec yee yek yen yeo yey yka ykk ykn yna yne ynk ynn yny yob yoc yoe yok yon yoo yoy yyb yyc yye yyy