-er -ol bbb bbc bbe bbg bbk bbl bbo bbr bcb bcc bce bcg bck bcl bco bcr be- beb bec bee beg bek bel beo ber bgb bgc bge bgg bgk bgl bgo bgr bkb bkc bke bkg bkk bkl bko bkr blb blc ble blg blk bll blo blr bob boc boe bog bok bol boo bor brb bre brg brk brl bro brr c-- cbb cbc cbe cbg cbk cbl cbo cbr ccb ccc cce ccg cck ccl cco ccr ce- ceb cec cee ceg cek cel ceo cer cgb cgc cge cgg cgl cgo cgr ckb ckc cko cl- clb clc cle clg clk cll clo clr co- cob coc coe cog cok col coo cor crb crc cre crg crk crl cro crr ebb ebc ebe ebg ebk ebl ebo ebr ec- ecb ecc ece ecg eck ecl eco ecr eeb eec eee eeg eek eel eeo eer egb egc ege egg egl ego egr ekb ekc eke ekg ekl eko ekr elb elc ele elg elk ell elo elr eo- eob eoc eoe eog eok eol eoo eor erb erc ere erg erk erl ero err gbc gbe gbg gbk gbl gbo gbr gcb gcc gce gcg gck gcl gco gcr ge- geb gec gee geg gek gel geo ger ggb ggc ggg ggo ggr gkb gko glb glc gle glg glk gll glo glr gob goc goe gog gok gol goo gor grb grc gre grg grk grl gro grr kbb kbc kbe kbk kbl kbo kbr kcb kcc kce kcg kck kcl kcr ke- keb kec kee keg kek kel keo ker kgb kgc kgl kgo kkb kkc kke kkk kkl kkr kl- klb klc klg klo klr kob koc koe kog kok kol koo kor krc krg krk krl kro krr lbb lbc lbe lbg lbk lbl lbo lbr lcb lcc lce lcg lck lcl lco lcr leb lec lee leg lek lel leo ler lgb lgc lge lgg lgk lgl lgo lgr lkb lkg lkl lkr llb llc lle llg llk lll llo llr lob loc loe log lok lol loo lor lrb lrc lrg lrk lro lrr ob- obb obc obe obg obk obl obo obr oc- ocb occ ocg ock ocl oco ocr oeb oec oee oeg oel oeo oer ogc oge ogg ogl ogo okb okc oke okg okk okl oko okr olb olc ole olg olk oll olo oo- oob ooc oog ook ool ooo oor or- orb orc ore org ork orl oro orr rbb rbc rbe rbg rbk rbl rbo rbr rcb rcc rce rcg rcl rco rcr re- reb rec ree reg rek rel reo rer rgb rgc rge rgg rgk rgo rgr rkb rkc rke rkg rkk rko rlc rle rlg rll rlo rlr rob roc roe rog rok rol roo ror rrb rrc rrg rrk rrl rrr