-er -ol bbb bbc bbe bbg bbh bbl bbo bbr bcb bcc bce bcg bch bcl bco bcr be- beb bec bee beg beh bel beo ber bgb bgc bge bgg bgh bgl bgo bgr bhb bhc bhe bhg bhh bhl bho bhr blb blc ble blg blh bll blo blr bob boc boe bog boh bol boo bor brb bre brg brh brl bro brr c-- cbb cbc cbe cbg cbh cbl cbo cbr ccb ccc cce ccg cch ccl cco ccr ce- ceb cec cee ceg ceh cel ceo cer cgb cgc cge cgg cgh cgl cgo cgr ch- chb chc che chg chh chl cho chr cl- clb clc cle clg clh cll clo clr co- cob coc coe cog coh col coo cor crb crc cre crg crh crl cro crr ebb ebc ebe ebg ebh ebl ebo ebr ec- ecb ecc ece ecg ech ecl eco ecr eeb eec eee eeg eel eeo eer egb egc ege egg egh egl ego egr ehb ehc ehe ehg ehh ehl eho ehr elb elc ele elg elh ell elo elr eo- eob eoc eoe eog eoh eol eoo eor erb erc ere erg erh erl ero err gbc gbe gbg gbh gbl gbo gbr gcb gcc gce gcg gch gcl gco gcr ge- geb gec gee geg geh gel geo ger ggb ggc ggg ggh ggo ggr ghb ghc ghe ghg ghh ghl gho ghr glb glc gle glg glh gll glo glr gob goc goe gog goh gol goo gor grb grc gre grg grh grl gro grr hbb hbc hbe hbg hbh hbl hbo hbr hcb hcc hce hcg hch hcl hco hcr he- heb hec hee heg heh hel heo her hgb hgc hge hgg hgh hgl hgo hgr hhb hhc hhe hhg hhh hhl hho hhr hlb hlc hle hlg hlh hll hlo hlr hob hoc hoe hog hoh hol hoo hor hr- hrb hrc hre hrg hrh hrl hro hrr lbb lbc lbe lbg lbh lbl lbo lbr lcb lcc lce lcg lch lcl lco lcr leb lec lee leg leh lel leo ler lgb lgc lge lgg lgh lgl lgo lgr lhb lhc lhh lho lhr llb llc lle llg lll llo llr lob loc loe log loh lol loo lor lrb lrc lrg lrh lro lrr ob- obb obc obe obg obh obl obo obr oc- ocb occ ocg och ocl oco ocr oeb oec oee oeg oeh oel oeo oer ogc oge ogg ogh ogl ogo ohc ohe ohg ohh ohl oho ohr olb olc ole olg oll olo oo- oob ooc oog ooh ool ooo oor or- orb orc ore org orh orl oro orr rbb rbc rbe rbg rbh rbl rbo rbr rcb rcc rce rcg rch rcl rco rcr re- reb rec ree reg reh rel reo rer rgb rgc rge rgg rgh rgo rgr rh- rhb rhc rhe rhg rhh rhl rho rhr rlc rle rlg rlh rll rlo rlr rob roc roe rog roh rol roo ror rrb rrc rrg rrh rrl rrr