-er -ey a-a a-b a-c aaa aab aac aae aar aau aay ab- aba abb abc abe abr abu aby ac- aca acb acc ace acr acu acy aea aeb aec aee aer aeu aey ar- ara arb arc are arr aru ary au- aua aub auc aue aur ay- aya ayc aye ayr ayu b-u baa bab bac bae bar bau bay bba bbb bbc bbe bbr bbu bby bca bcb bcc bce bcr bcu bcy be- bea beb bec bee ber beu bey bra brb bre brr bru bry bua bub buc bue bur buu buy by- bya byc bye byr byu c-- caa cab cac cae car cau cay cba cbb cbc cbe cbr cbu cby cca ccb ccc cce ccr ccu ce- cea ceb cec cee cer ceu cey cra crb crc cre crr cru cry cua cub cuc cue cur cuu cuy cya cyb cyc cye cyr eaa eab eac eae ear eau eba ebb ebc ebe ebr ebu eby ec- eca ecb ecc ece ecr ecu eea eeb eec eee eer eey era erb erc ere err eru ery eu- eua eub euc eue eur eya eyc eye eyr ra- raa rab rac rae rar rau ray rba rbb rbc rbe rbr rbu rca rcb rcc rce rcr rcu re- rea reb rec ree rer reu rey rra rrb rrc rrr rru rua rub ruc rue rur ruu ruy ry- rya ryc rye ryr ryu ryy ua- uaa uab uac uae uar uau uay uba ubb ubc ube ubr ubu uby uca ucb ucc uce ucr ucu uea ueb uec uee uer uey ur- ura urb urc ure urr uru ury uua uuc uue uur uuu uyc uyu yaa yab yac yae yar yau yay ybc ybe ybr yby yca ycc yce ycu ycy yea yeb yec yee yer yey yra yrc yre yru yua yue yur yuu yuy yyb yyc yye yyu yyy