-er -ol bbb bbc bbe bbg bbl bbo bbr bcb bcc bce bcg bcl bco bcr be- beb bec bee beg bel beo ber bgb bgc bge bgg bgl bgo bgr blb blc ble blg bll blo blr bob boc boe bog bol boo bor brb bre brg brl bro brr c-- cbb cbc cbe cbg cbl cbo cbr ccb ccc cce ccg ccl cco ccr ce- ceb cec cee ceg cel ceo cer cgb cgc cge cgg cgl cgo cgr cl- clb clc cle clg cll clo clr co- cob coc coe cog col coo cor crb crc cre crg crl cro crr ebb ebc ebe ebg ebl ebo ebr ec- ecb ecc ece ecg ecl eco ecr eeb eec eee eeg eel eeo eer egb egc ege egg egl ego egr elb elc ele elg ell elo elr eo- eob eoc eoe eog eol eoo eor erb erc ere erg erl ero err gbc gbe gbg gbl gbo gbr gcb gcc gce gcg gcl gco gcr ge- geb gec gee geg gel geo ger ggb ggc ggg ggo ggr glb glc gle glg gll glo glr gob goc goe gog gol goo gor grb grc gre grg grl gro grr lbb lbc lbe lbg lbl lbo lbr lcb lcc lce lcg lcl lco lcr leb lec lee leg lel leo ler lgb lgc lge lgg lgl lgo lgr llb llc lle llg lll llo llr lob loc loe log lol loo lor lrb lrc lrg lro lrr ob- obb obc obe obg obl obo obr oc- ocb occ ocg ocl oco ocr oeb oec oee oeg oel oeo oer ogc oge ogg ogl ogo olb olc ole olg oll olo oo- oob ooc oog ool ooo oor or- orb orc ore org orl oro orr rbb rbc rbe rbg rbl rbo rbr rcb rcc rce rcg rcl rco rcr re- reb rec ree reg rel reo rer rgb rgc rge rgg rgo rgr rlc rle rlg rll rlo rlr rob roc roe rog rol roo ror rrb rrc rrg rrl rrr