-er -ol b-p bbb bbe bbl bbo bbp bbr be- beb bee bel beo bep ber blb ble bll blo blp blr bob boe bol boo bop bor bpb bpe bpl bpo bpp bpr brb bre brl bro brp brr ebb ebe ebl ebo ebp ebr eeb eee eel eeo eep eer elb ele ell elo elp elr eo- eob eoe eol eoo eop eor ep- epb epe epl epo epp epr erb ere erl ero erp err l-p lbb lbe lbl lbo lbp lbr leb lee lel leo lep ler llb lle lll llo llp llr lob loe lol loo lop lor lpb lpe lpl lpo lpp lpr lrb lro lrp lrr ob- obb obe obl obo obp obr oeb oee oel oeo oep oer olb ole oll olo olp oo- oob ool ooo oop oor op- opb ope opl opo opp opr or- orb ore orl oro orp orr p-p pbb pbe pbl pbo pbp pbr peb pee pel peo pep per plb ple pll plo plp plr pob poe pol poo pop por ppb ppe ppl ppo ppp ppr prb pre prl pro prp prr rbb rbe rbl rbo rbp rbr re- reb ree rel reo rep rer rle rll rlo rlp rlr rob roe rol roo rop ror rpb rpe rpl rpo rpp rpr rrb rrl rrp rrr