-er -ol bbb bbc bbe bbg bbl bbo bbr bbs bcb bcc bce bcg bcl bco bcr bcs be- beb bec bee beg bel beo ber bes bgb bgc bge bgg bgl bgo bgr bgs blb blc ble blg bll blo blr bls bob boc boe bog bol boo bor bos brb bre brg brl bro brr brs bsb bsc bse bsg bsl bso bsr bss c-- cbb cbc cbe cbg cbl cbo cbr cbs ccb ccc cce ccg ccl cco ccr ccs ce- ceb cec cee ceg cel ceo cer ces cgb cgc cge cgg cgl cgo cgr cgs cl- clb clc cle clg cll clo clr cls co- cob coc coe cog col coo cor cos crb crc cre crg crl cro crr crs csb csc cse csg csl cso csr css ebb ebc ebe ebg ebl ebo ebr ebs ec- ecb ecc ece ecg ecl eco ecr ecs eeb eec eee eeg eel eeo eer ees egb egc ege egg egl ego egr egs elb elc ele elg ell elo elr els eo- eob eoc eoe eog eol eoo eor eos erb erc ere erg erl ero err ers es- esb esc ese esg esl eso esr ess gbc gbe gbg gbl gbo gbr gbs gcb gcc gce gcg gcl gco gcr gcs ge- geb gec gee geg gel geo ger ges ggb ggc ggg ggo ggr ggs glb glc gle glg gll glo glr gls gob goc goe gog gol goo gor gos grb grc gre grg grl gro grr grs gsb gsc gse gsg gsl gso gsr gss lbb lbc lbe lbg lbl lbo lbr lbs lcb lcc lce lcg lcl lco lcr lcs leb lec lee leg lel leo ler les lgb lgc lge lgg lgl lgo lgr lgs llb llc lle llg lll llo llr lls lob loc loe log lol loo lor los lrb lrc lrg lro lrr lrs lsb lsc lse lsg lsl lso lsr lss ob- obb obc obe obg obl obo obr obs oc- ocb occ ocg ocl oco ocr ocs oeb oec oee oeg oel oeo oer oes ogc oge ogg ogl ogo ogs olb olc ole olg oll olo ols oo- oob ooc oog ool ooo oor oos or- orb orc ore org orl oro orr ors os- osb osc ose osg osl oso osr oss rbb rbc rbe rbg rbl rbo rbr rbs rcb rcc rce rcg rcl rco rcr rcs re- reb rec ree reg rel reo rer res rgb rgc rge rgg rgo rgr rgs rlc rle rlg rll rlo rlr rls rob roc roe rog rol roo ror ros rrb rrc rrg rrl rrr rrs rsb rsc rse rsg rsl rso rsr rss sbb sbc sbe sbg sbl sbo sbr sbs scb scc sce scg scl sco scr scs se- seb sec see seg sel seo ser ses sgb sgc sge sgg sgl sgo sgr sgs slb slc sle slg sll slo slr sls sob soc soe sog sol soo sor sos sr- srb src sre srg srl sro srr srs ss- ssb ssc sse ssg ssl sso ssr sss