-er -ol bbb bbc bbe bbk bbl bbn bbo bbr bcb bcc bce bck bcl bcn bco bcr be- beb bec bee bek bel ben beo ber bkb bkc bke bkk bkl bkn bko bkr blb blc ble blk bll bln blo blr bnb bnc bne bnk bnl bnn bno bnr bob boc boe bok bol bon boo bor brb bre brk brl brn bro brr c-- cbb cbc cbe cbk cbl cbn cbo cbr ccb ccc cce cck ccl ccn cco ccr ce- ceb cec cee cek cel cen ceo cer ckb ckc cko cl- clb clc cle clk cll cln clo clr cn- cnb cnc cne cnl cnn cno cnr co- cob coc coe cok col con coo cor crb crc cre crk crl crn cro crr ebb ebc ebe ebk ebl ebn ebo ebr ec- ecb ecc ece eck ecl ecn eco ecr eeb eec eee eek eel een eeo eer ekb ekc eke ekl eko ekr elb elc ele elk ell eln elo elr en- enb enc ene enk enl enn eno enr eo- eob eoc eoe eok eol eon eoo eor erb erc ere erk erl ern ero err kbb kbc kbe kbk kbl kbn kbo kbr kcb kcc kce kck kcl kcn kcr ke- keb kec kee kek kel ken keo ker kkb kkc kke kkk kkl kkn kkr kl- klb klc klo klr kn- knc kne knk knl knn kno knr kob koc koe kok kol kon koo kor krc krk krl krn kro krr lbb lbc lbe lbk lbl lbo lbr lcb lcc lce lck lcl lcn lco lcr leb lec lee lek lel len leo ler lkb lkl lkr llb llc lle llk lll lln llo llr lnb lnc lne lnk lnl lnn lno lnr lob loc loe lok lol lon loo lor lrb lrc lrk lrn lro lrr nbb nbc nbe nbk nbl nbn nbo nbr ncb ncc nce nck ncl ncn nco ncr ne- neb nec nee nek nel nen neo ner nkc nke nkk nkn nko nkr nlb nlc nle nlk nll nln nlo nlr nnb nnc nne nnk nnl nnn nno no- nob noc noe nok nol non noo nor nrb nrc nre nrk nrl nrn nro nrr ob- obb obc obe obk obl obn obo obr oc- ocb occ ock ocl ocn oco ocr oeb oec oee oel oen oeo oer okb okc oke okk okl oko okr olb olc ole olk oll oln olo on- onb onc one onk onl onn ono onr oo- oob ooc ook ool oon ooo oor or- orb orc ore ork orl orn oro orr rbb rbc rbe rbk rbl rbn rbo rbr rcb rcc rce rcl rcn rco rcr re- reb rec ree rek rel ren reo rer rkb rkc rke rkk rko rlc rle rll rln rlo rlr rnb rnc rnn rno rnr rob roc roe rok rol ron roo ror rrb rrc rrk rrl rrn rrr