-er -ey a-a a-b a-c aaa aab aac aae aak aar aay ab- aba abb abc abe abk abr aby ac- aca acb acc ace ack acr acy aea aeb aec aee aek aer aey aka akb akc ake akk akr ar- ara arb arc are ark arr ary ay- aya ayc aye ayk ayr baa bab bac bae bak bar bay bba bbb bbc bbe bbk bbr bby bca bcb bcc bce bck bcr bcy be- bea beb bec bee bek ber bey bka bkb bkc bke bkk bkr bra brb bre brk brr bry by- bya byc bye byk byr c-- caa cab cac cae cak car cay cba cbb cbc cbe cbk cbr cby cca ccb ccc cce cck ccr ce- cea ceb cec cee cek cer cey cka ckb ckc cky cra crb crc cre crk crr cry cya cyb cyc cye cyk cyr eaa eab eac eae eak ear eba ebb ebc ebe ebk ebr eby ec- eca ecb ecc ece eck ecr eea eeb eec eee eek eer eey eka ekb ekc eke ekr eky era erb erc ere erk err ery eya eyc eye eyr ka- kaa kab kac kae kak kar kay kba kbb kbc kbe kbk kbr kca kcb kcc kce kck kcr ke- kea keb kec kee kek ker key kkb kkc kke kkk kkr kky kra krc krk krr kry kya kyc kye kyr ra- raa rab rac rae rak rar ray rba rbb rbc rbe rbk rbr rca rcb rcc rce rcr re- rea reb rec ree rek rer rey rkb rkc rke rkk rky rra rrb rrc rrk rrr ry- rya ryc rye ryk ryr ryy yaa yab yac yae yak yar yay ybc ybe ybr yby yca ycc yce ycy yea yeb yec yee yek yer yey yka ykk yra yrc yre yyb yyc yye yyy