-er -ey bbb bbc bbe bbr bbw bby bcb bcc bce bcr bcy be- beb bec bee ber bew bey brb bre brr brw bry bwb bwc bwr bwy by- byc bye byr c-- cbb cbc cbe cbr cbw cby ccb ccc cce ccr ccw ce- ceb cec cee cer cew cey crb crc cre crr crw cry cw- cwb cwc cwe cwr cyb cyc cye cyr cyw ebb ebc ebe ebr ebw eby ec- ecb ecc ece ecr ecw eeb eec eee eer eew eey erb erc ere err erw ery ewb ewc ewe ewr eww ewy eyc eye eyr rbb rbc rbe rbr rbw rcb rcc rce rcr rcw re- reb rec ree rer rew rey rrb rrc rrr rwb rwc rwe rwr rwy ry- ryc rye ryr ryy wbb wbc wbe wbr wbw wcb wcc wce wcr wcw web wec wee wer wew wey wr- wrc wre wrr wrw wry wwc wwe www wy- wyc wye wyr ybc ybe ybr yby ycc yce ycw ycy yeb yec yee yer yew yey yrc yre ywc yyb yyc yye yyy