-er -ey bbb bbc bbe bbr bbs bbx bby bcb bcc bce bcr bcs bcx bcy be- beb bec bee ber bes bex bey brb bre brr brs brx bry bsb bsc bse bsr bss bsx bsy bxb bxx by- byc bye byr bys c-- cbb cbc cbe cbr cbs cbx cby ccb ccc cce ccr ccs ccx ce- ceb cec cee cer ces cex cey crb crc cre crr crs crx cry csb csc cse csr css csx csy cxc cxr cxs cxx cyb cyc cye cyr cys ebb ebc ebe ebr ebs ebx eby ec- ecb ecc ece ecr ecs ecx eeb eec eee eer ees eex eey erb erc ere err ers ery es- esb esc ese esr ess esx esy ex- exc exe exr exs exx exy eyc eye eyr eys rbb rbc rbe rbr rbs rbx rcb rcc rce rcr rcs rcx re- reb rec ree rer res rex rey rrb rrc rrr rrs rsb rsc rse rsr rss rsx rxr rxs ry- ryc rye ryr rys ryy sbb sbc sbe sbr sbs sbx sby scb scc sce scr scs scx se- seb sec see ser ses sex sey sr- srb src sre srr srs srx sry ss- ssb ssc sse ssr sss ssx sxc sxs sy- syb syc sye syr sys syx xbc xbe xbr xbx xcb xcr xcx xee xer xes xex xrc xrx xry xsb xsc xss xxx xxy xyr xyy ybc ybe ybr ybs yby ycc yce ycs ycy yeb yec yee yer yes yex yey yrc yre yrs ysb ysc yse ysr yss ysy yxe yxy yyb yyc yye yys yyy