-er -ol bbb bbc bbe bbl bbo bbr bcb bcc bce bcl bco bcr be- beb bec bee bel beo ber blb blc ble bll blo blr bob boc boe bol boo bor brb bre brl bro brr c-- cbb cbc cbe cbl cbo cbr ccb ccc cce ccl cco ccr ce- ceb cec cee cel ceo cer cl- clb clc cle cll clo clr co- cob coc coe col coo cor crb crc cre crl cro crr ebb ebc ebe ebl ebo ebr ec- ecb ecc ece ecl eco ecr eeb eec eee eel eeo eer elb elc ele ell elo elr eo- eob eoc eoe eol eoo eor erb erc ere erl ero err lbb lbc lbe lbl lbo lbr lcb lcc lce lcl lco lcr leb lec lee lel leo ler llb llc lle lll llo llr lob loc loe lol loo lor lrb lrc lro lrr ob- obb obc obe obl obo obr oc- ocb occ ocl oco ocr oeb oec oee oel oeo oer olb olc ole oll olo oo- oob ooc ool ooo oor or- orb orc ore orl oro orr rbb rbc rbe rbl rbo rbr rcb rcc rce rcl rco rcr re- reb rec ree rel reo rer rlc rle rll rlo rlr rob roc roe rol roo ror rrb rrc rrl rrr