-er -ol bbb bbc bbe bbg bbl bbn bbo bbr bcb bcc bce bcg bcl bcn bco bcr be- beb bec bee beg bel ben beo ber bgb bgc bge bgg bgl bgn bgo bgr blb blc ble blg bll bln blo blr bnb bnc bne bng bnl bnn bno bnr bob boc boe bog bol bon boo bor brb bre brg brl brn bro brr c-- cbb cbc cbe cbg cbl cbn cbo cbr ccb ccc cce ccg ccl ccn cco ccr ce- ceb cec cee ceg cel cen ceo cer cgb cgc cge cgg cgl cgn cgo cgr cl- clb clc cle clg cll cln clo clr cn- cnb cnc cne cng cnl cnn cno cnr co- cob coc coe cog col con coo cor crb crc cre crg crl crn cro crr ebb ebc ebe ebg ebl ebn ebo ebr ec- ecb ecc ece ecg ecl ecn eco ecr eeb eec eee eeg eel een eeo eer egb egc ege egg egl egn ego egr elb elc ele elg ell eln elo elr en- enb enc ene eng enl enn eno enr eo- eob eoc eoe eog eol eon eoo eor erb erc ere erg erl ern ero err gbc gbe gbg gbl gbn gbo gbr gcb gcc gce gcg gcl gcn gco gcr ge- geb gec gee geg gel gen geo ger ggb ggc ggg ggn ggo ggr glb glc gle glg gll gln glo glr gnb gnc gne gnl gnn gno gnr gob goc goe gog gol gon goo gor grb grc gre grg grl grn gro grr lbb lbc lbe lbg lbl lbo lbr lcb lcc lce lcg lcl lcn lco lcr leb lec lee leg lel len leo ler lgb lgc lge lgg lgl lgn lgo lgr llb llc lle llg lll lln llo llr lnb lnc lne lng lnl lnn lno lnr lob loc loe log lol lon loo lor lrb lrc lrg lrn lro lrr nbb nbc nbe nbg nbl nbn nbo nbr ncb ncc nce ncg ncl ncn nco ncr ne- neb nec nee neg nel nen neo ner ngb ngc nge ngg ngl ngn ngo nlb nlc nle nlg nll nln nlo nlr nnb nnc nne nng nnl nnn nno no- nob noc noe nog nol non noo nor nrb nrc nre nrg nrl nrn nro nrr ob- obb obc obe obg obl obn obo obr oc- ocb occ ocg ocl ocn oco ocr oeb oec oee oeg oel oen oeo oer ogc oge ogg ogl ogn ogo olb olc ole olg oll oln olo on- onb onc one ong onl onn ono onr oo- oob ooc oog ool oon ooo oor or- orb orc ore org orl orn oro orr rbb rbc rbe rbg rbl rbn rbo rbr rcb rcc rce rcg rcl rcn rco rcr re- reb rec ree reg rel ren reo rer rgb rgc rge rgg rgn rgo rgr rlc rle rlg rll rln rlo rlr rnb rnc rng rnn rno rnr rob roc roe rog rol ron roo ror rrb rrc rrg rrl rrn rrr