-er -ol bbb bbc bbe bbl bbo bbr bbx bcb bcc bce bcl bco bcr bcv bcx be- beb bec bee bel beo ber bev bex blb blc ble bll blo blr blv blx bob boc boe bol boo bor bov box brb bre brl bro brr brv brx bvb bvc bve bvl bvo bvr bvv bxb bxl bxo bxx c-- cbb cbc cbe cbl cbo cbr cbv cbx ccb ccc cce ccl cco ccr ccv ccx ce- ceb cec cee cel ceo cer cev cex cl- clb clc cle cll clo clr clv clx co- cob coc coe col coo cor cov cox crb crc cre crl cro crr crv crx cvb cvc cve cvl cvo cvr cvv cvx cxc cxl cxo cxr cxv cxx ebb ebc ebe ebl ebo ebr ebv ebx ec- ecb ecc ece ecl eco ecr ecv ecx eeb eec eee eel eeo eer eev eex elb elc ele ell elo elr elv elx eo- eob eoc eoe eol eoo eor erb erc ere erl ero err erv evb evc eve evl evo evr evv ex- exc exe exl exo exr exx lbb lbc lbe lbl lbo lbr lbv lbx lcb lcc lce lcl lco lcr lcv lcx leb lec lee lel leo ler lev lex llb llc lle lll llo llr llv lob loc loe lol loo lor lov lox lrb lrc lro lrr lrv lvb lvc lve lvl lvr lvv lvx lxc lxo lxr lxv lxx ob- obb obc obe obl obo obr obv obx oc- ocb occ ocl oco ocr ocv ocx oeb oec oee oel oeo oer oex olb olc ole oll olo oo- oob ooc ool ooo oor oov oox or- orb orc ore orl oro orr orv orx ov- ovb ovc ove ovl ovo ovv ox- oxb oxc oxo oxx rbb rbc rbe rbl rbo rbr rbx rcb rcc rce rcl rco rcr rcv rcx re- reb rec ree rel reo rer rev rex rlc rle rll rlo rlr rob roc roe rol roo ror rov rox rrb rrc rrl rrr rvb rvc rve rvl rvo rvr rvv rxr v-e vbc vbl vbo vbr vbv vcc vce vcl vco vcr vcx veb vec vee vel veo ver vex vl- vlb vlc vle vll vlo vlv vob voc voe vol voo vor vov vox vrb vrc vre vrr vvb vvc vvo vvr vvv vxl vxr vxv xbc xbe xbl xbr xbx xcb xcl xcr xcv xcx xee xel xer xev xex xlb xlr xlv xoc xoo xor xov xox xrc xrx xvl xxl xxo xxv xxx