-er -ey a-a a-b a-c aaa aab aac aae aap aar aay ab- aba abb abc abe abp abr aby ac- aca acb acc ace acp acr acy aea aeb aec aee aep aer aey ap- apa apb apc ape app apr apy ar- ara arb arc are arp arr ary ay- aya ayc aye ayp ayr b-p baa bab bac bae bap bar bay bba bbb bbc bbe bbp bbr bby bca bcb bcc bce bcp bcr bcy be- bea beb bec bee bep ber bey bpa bpb bpc bpe bpp bpr bpy bra brb bre brp brr bry by- bya byc bye byp byr c-- caa cab cac cae cap car cay cba cbb cbc cbe cbp cbr cby cca ccb ccc cce ccp ccr ce- cea ceb cec cee cep cer cey cpa cpb cpc cpe cpp cpr cra crb crc cre crp crr cry cya cyb cyc cye cyp cyr eaa eab eac eae eap ear eba ebb ebc ebe ebp ebr eby ec- eca ecb ecc ece ecr eea eeb eec eee eep eer eey ep- epa epb epc epe epp epr era erb erc ere erp err ery eya eyc eye eyp eyr p-p paa pab pac pae pap par pay pba pbb pbc pbe pbp pbr pby pca pcb pcc pce pcp pcr pea peb pec pee pep per pey ppa ppb ppc ppe ppp ppr pra prb prc pre prp prr pry py- pya pyb pyc pye pyr ra- raa rab rac rae rap rar ray rba rbb rbc rbe rbp rbr rca rcb rcc rce rcp rcr re- rea reb rec ree rep rer rey rpa rpb rpc rpe rpp rpr rra rrb rrc rrp rrr ry- rya ryc rye ryr ryy yaa yab yac yae yap yar yay ybc ybe ybp ybr yby yca ycc yce ycp ycy yea yeb yec yee yep yer yey ypa yra yrc yre yrp yyb yyc yye yyy