-er -ey bbb bbc bbe bbr bbt bbx bby bcb bcc bce bcr bct bcx bcy be- beb bec bee ber bet bex bey brb bre brr brt brx bry btb btc bte btr btt btx bty bxb bxx by- byc bye byr byt c-- cbb cbc cbe cbr cbt cbx cby ccb ccc cce ccr cct ccx ce- ceb cec cee cer cet cex cey crb crc cre crr crt crx cry ctb ctc cte ctr ctt ctx cty cxc cxr cxt cxx cyb cyc cye cyr cyt ebb ebc ebe ebr ebt ebx eby ec- ecb ecc ece ecr ect ecx eeb eec eee eer eet eex eey erb erc ere err ert ery etb etc ete etr ett etx ety ex- exc exe exr ext exx exy eyc eye eyr eyt rbb rbc rbe rbr rbt rbx rcb rcc rce rcr rct rcx re- reb rec ree rer ret rex rey rrb rrc rrr rrt rtb rtc rte rtr rtt rtx rty rxr ry- ryc rye ryr ryy t-x tbb tbc tbe tbr tbt tcb tcc tce tcr tct tcx te- teb tec tee ter tet tex tey trb trc tre trr trt trx try ttb ttc tte ttr ttt ttx tty txe txt tyc tye tyr tyt xbc xbe xbr xbx xcb xcr xcx xee xer xet xex xrc xrt xrx xry xtc xtr xtx xty xxx xxy xyr xyy ybc ybe ybr yby ycc yce ycy yeb yec yee yer yet yex yey yrc yre yrt ytc yte ytr ytt yxe yxy yyb yyc yye yyt yyy