-er -ol bbb bbc bbe bbf bbg bbl bbo bbr bcb bcc bce bcf bcg bcl bco bcr be- beb bec bee bef beg bel beo ber bfb bfc bfe bff bfg bfl bfo bfr bgb bgc bge bgf bgg bgl bgo bgr blb blc ble blf blg bll blo blr bob boc boe bof bog bol boo bor brb bre brf brg brl bro brr c-- cbb cbc cbe cbf cbg cbl cbo cbr ccb ccc cce ccf ccg ccl cco ccr ce- ceb cec cee cef ceg cel ceo cer cfb cfc cfe cff cfg cfl cfo cfr cgb cgc cge cgg cgl cgo cgr cl- clb clc cle clf clg cll clo clr co- cob coc coe cof cog col coo cor crb crc cre crf crg crl cro crr ebb ebc ebe ebf ebg ebl ebo ebr ec- ecb ecc ece ecf ecg ecl eco ecr eeb eec eee eef eeg eel eeo eer ef- efb efc efe eff efg efl efo efr egb egc ege egf egg egl ego egr elb elc ele elf elg ell elo elr eo- eob eoc eoe eof eog eol eoo eor erb erc ere erf erg erl ero err fbb fbc fbe fbf fbg fbl fbo fbr fcb fcc fce fcf fcg fcl fco fcr feb fec fee fef feg fel feo fer ffc ffe fff ffg ffl ffo ffr fgb fgc fge fgf fgg fgl fgr flb flc fle flf flg fll flo flr fob foc foe fof fog fol foo for frb frc fre frf frg frl fro frr gbc gbe gbf gbg gbl gbo gbr gcb gcc gce gcf gcg gcl gco gcr ge- geb gec gee gef geg gel geo ger gfb gfc gfe gff gfl gfo gfr ggb ggc ggg ggo ggr glb glc gle glf glg gll glo glr gob goc goe gof gog gol goo gor grb grc gre grf grg grl gro grr lbb lbc lbe lbf lbg lbl lbo lbr lcb lcc lce lcf lcg lcl lco lcr leb lec lee lef leg lel leo ler lfb lfc lfe lff lfg lfl lfo lfr lgb lgc lge lgf lgg lgl lgo lgr llb llc lle llf llg lll llo llr lob loc loe lof log lol loo lor lrb lrc lrf lrg lro lrr ob- obb obc obe obf obg obl obo obr oc- ocb occ ocf ocg ocl oco ocr oeb oec oee oef oeg oel oeo oer of- ofb ofc ofe off ofg ofl ofo ofr ogc oge ogf ogg ogl ogo olb olc ole olf olg oll olo oo- oob ooc oof oog ool ooo oor or- orb orc ore orf org orl oro orr rbb rbc rbe rbf rbg rbl rbo rbr rcb rcc rce rcf rcg rcl rco rcr re- reb rec ree ref reg rel reo rer rfb rfc rfe rff rfg rfl rfo rfr rgb rgc rge rgf rgg rgo rgr rlc rle rlf rlg rll rlo rlr rob roc roe rof rog rol roo ror rrb rrc rrf rrg rrl rrr