-er -ol bbb bbc bbe bbg bbl bbm bbo bbr bcb bcc bce bcg bcl bcm bco bcr be- beb bec bee beg bel bem beo ber bgb bgc bge bgg bgl bgm bgo bgr blb blc ble blg bll blm blo blr bmb bmc bme bmg bml bmm bmo bmr bob boc boe bog bol bom boo bor brb bre brg brl brm bro brr c-- cbb cbc cbe cbg cbl cbm cbo cbr ccb ccc cce ccg ccl ccm cco ccr ce- ceb cec cee ceg cel cem ceo cer cgb cgc cge cgg cgl cgm cgo cgr cl- clb clc cle clg cll clm clo clr cmb cmc cme cmg cml cmm cmo cmr co- cob coc coe cog col com coo cor crb crc cre crg crl crm cro crr ebb ebc ebe ebg ebl ebm ebo ebr ec- ecb ecc ece ecg ecl ecm eco ecr eeb eec eee eeg eel eem eeo eer egb egc ege egg egl egm ego egr elb elc ele elg ell elm elo elr em- emb emc eme emg eml emm emo emr eo- eob eoc eoe eog eol eom eoo eor erb erc ere erg erl erm ero err gbc gbe gbg gbl gbm gbo gbr gcb gcc gce gcg gcl gcm gco gcr ge- geb gec gee geg gel gem geo ger ggb ggc ggg ggm ggo ggr glb glc gle glg gll glm glo glr gmb gmc gme gmg gml gmm gmo gmr gob goc goe gog gol gom goo gor grb grc gre grg grl grm gro grr lbb lbc lbe lbg lbl lbm lbo lbr lcb lcc lce lcg lcl lcm lco lcr leb lec lee leg lel lem leo ler lgb lgc lge lgg lgl lgm lgo lgr llb llc lle llg lll llm llo llr lmb lmc lme lmg lml lmm lmo lmr lob loc loe log lol lom loo lor lrb lrc lrg lrm lro lrr m-o m-r mbb mbc mbe mbg mbl mbm mbo mbr mc- mcb mcc mce mcg mcl mcm mco mcr meb mec mee meg mel mem meo mer mgb mgc mge mgl mgm mgo mgr mlb mlc mle mlg mll mlm mlo mlr mmb mmc mme mmg mml mmm mmo mmr mob moc moe mog mol mom moo mor mrb mrc mre mrg mrl mrm mro mrr ob- obb obc obe obg obl obm obo obr oc- ocb occ ocg ocl ocm oco ocr oeb oec oee oeg oel oem oeo oer ogc oge ogg ogl ogo olb olc ole olg oll olm olo om- omb omc ome omg oml omm omo omr oo- oob ooc oog ool oom ooo oor or- orb orc ore org orl orm oro orr rbb rbc rbe rbg rbl rbm rbo rbr rcb rcc rce rcg rcl rcm rco rcr re- reb rec ree reg rel rem reo rer rgb rgc rge rgg rgo rgr rlc rle rlg rll rlm rlo rlr rmb rmc rme rmg rml rmm rmo rmr rob roc roe rog rol rom roo ror rrb rrc rrg rrl rrm rrr