-er -ey a-a a-b aaa aab aae aak aan aar aay ab- aba abb abe abk abn abr aby aea aeb aee aek aen aer aey aka akb ake akk akn akr an- ana anb ane ank ann anr any ar- ara arb are ark arn arr ary ay- aya aye ayk ayn ayr baa bab bae bak ban bar bay bba bbb bbe bbk bbn bbr bby be- bea beb bee bek ben ber bey bka bkb bke bkk bkn bkr bna bnb bne bnk bnn bnr bra brb bre brk brn brr bry by- bya bye byk byn byr eaa eab eae eak ean ear eba ebb ebe ebk ebn ebr eby eea eeb eee eek een eer eey eka ekb eke ekr eky en- ena enb ene enk enn enr eny era erb ere erk ern err ery eya eye eyn eyr ka- kaa kab kae kak kan kar kay kba kbb kbe kbk kbn kbr ke- kea keb kee kek ken ker key kkb kke kkk kkn kkr kky kn- kna kne knk knn knr kra krk krn krr kry kya kye kyn kyr naa nab nae nak nan nar nay nba nbb nbe nbk nbn nbr ne- nea neb nee nek nen ner ney nka nke nkk nkn nkr nky nna nnb nne nnk nnn nra nrb nre nrk nrn nrr nry nya nye nyk nyn nyy ra- raa rab rae rak ran rar ray rba rbb rbe rbk rbn rbr re- rea reb ree rek ren rer rey rkb rke rkk rky rna rnb rnn rnr rny rra rrb rrk rrn rrr ry- rya rye ryk ryn ryr ryy yaa yab yae yak yan yar yay ybe ybr yby yea yeb yee yek yen yer yey yka ykk ykn yna yne ynk ynn yny yra yre yrn yyb yye yyy