-er -ey bbb bbc bbe bbr bbs bbt bby bcb bcc bce bcr bcs bct bcy be- beb bec bee ber bes bet bey brb bre brr brs brt bry bsb bsc bse bsr bss bst bsy btb btc bte btr bts btt bty by- byc bye byr bys byt c-- cbb cbc cbe cbr cbs cbt cby ccb ccc cce ccr ccs cct ce- ceb cec cee cer ces cet cey crb crc cre crr crs crt cry csb csc cse csr css cst csy ctb ctc cte ctr cts ctt cty cyb cyc cye cyr cys cyt ebb ebc ebe ebr ebs ebt eby ec- ecb ecc ece ecr ecs ect eeb eec eee eer ees eet eey erb erc ere err ers ert ery es- esb esc ese esr ess est esy etb etc ete etr ets ett ety eyc eye eyr eys eyt rbb rbc rbe rbr rbs rbt rcb rcc rce rcr rcs rct re- reb rec ree rer res ret rey rrb rrc rrr rrs rrt rsb rsc rse rsr rss rst rtb rtc rte rtr rts rtt rty ry- ryc rye ryr rys ryy sbb sbc sbe sbr sbs sbt sby scb scc sce scr scs sct se- seb sec see ser ses set sey sr- srb src sre srr srs srt sry ss- ssb ssc sse ssr sss sst stb stc ste str sts stt sty sy- syb syc sye syr sys syt tbb tbc tbe tbr tbs tbt tcb tcc tce tcr tcs tct te- teb tec tee ter tes tet tey trb trc tre trr trs trt try tsb tsc tse tsr tss tst tsy ttb ttc tte ttr tts ttt tty tyc tye tyr tys tyt ybc ybe ybr ybs yby ycc yce ycs ycy yeb yec yee yer yes yet yey yrc yre yrs yrt ysb ysc yse ysr yss yst ysy ytc yte ytr yts ytt yyb yyc yye yys yyt yyy