-er -ey a-a a-b a-c aaa aab aac aae aag aar aay ab- aba abb abc abe abg abr aby ac- aca acb acc ace acg acr acy aea aeb aec aee aeg aer aey ag- aga agb agc age agg agr agy ar- ara arb arc are arg arr ary ay- aya ayc aye ayr baa bab bac bae bag bar bay bba bbb bbc bbe bbg bbr bby bca bcb bcc bce bcg bcr bcy be- bea beb bec bee beg ber bey bga bgb bgc bge bgg bgr bra brb bre brg brr bry by- bya byc bye byg byr c-- caa cab cac cae cag car cay cba cbb cbc cbe cbg cbr cby cca ccb ccc cce ccg ccr ce- cea ceb cec cee ceg cer cey cga cgb cgc cge cgg cgr cgy cra crb crc cre crg crr cry cya cyb cyc cye cyg cyr eaa eab eac eae eag ear eba ebb ebc ebe ebg ebr eby ec- eca ecb ecc ece ecg ecr eea eeb eec eee eeg eer eey ega egb egc ege egg egr egy era erb erc ere erg err ery eya eyc eye eyr gaa gab gac gae gag gar gay gba gbc gbe gbg gbr gby gca gcb gcc gce gcg gcr ge- gea geb gec gee geg ger gey gga ggb ggc ggg ggr gra grb grc gre grg grr gry gy- gya gyb gye gyr ra- raa rab rac rae rag rar ray rba rbb rbc rbe rbg rbr rca rcb rcc rce rcg rcr re- rea reb rec ree reg rer rey rga rgb rgc rge rgg rgr rra rrb rrc rrg rrr ry- rya ryc rye ryg ryr ryy yaa yab yac yae yag yar yay ybc ybe ybg ybr yby yca ycc yce ycy yea yeb yec yee yeg yer yey yga ygc yra yrc yre yrg yyb yyc yye yyg yyy