-er bbb bbc bbe bbg bbh bbo bbr bcb bcc bce bcg bch bco bcr be- beb bec bee beg beh beo ber bgb bgc bge bgg bgh bgo bgr bhb bhc bhe bhg bhh bho bhr bob boc boe bog boh boo bor brb bre brg brh bro brr c-- cbb cbc cbe cbg cbh cbo cbr ccb ccc cce ccg cch cco ccr ce- ceb cec cee ceg ceh ceo cer cgb cgc cge cgg cgh cgo cgr ch- chb chc che chg chh cho chr co- cob coc coe cog coh coo cor crb crc cre crg crh cro crr ebb ebc ebe ebg ebh ebo ebr ec- ecb ecc ece ecg ech eco ecr eeb eec eee eeg eeo eer egb egc ege egg egh ego egr ehb ehc ehe ehg ehh eho ehr eo- eob eoc eoe eog eoh eoo eor erb erc ere erg erh ero err gbc gbe gbg gbh gbo gbr gcb gcc gce gcg gch gco gcr ge- geb gec gee geg geh geo ger ggb ggc ggg ggh ggo ggr ghb ghc ghe ghg ghh gho ghr gob goc goe gog goh goo gor grb grc gre grg grh gro grr hbb hbc hbe hbg hbh hbo hbr hcb hcc hce hcg hch hco hcr he- heb hec hee heg heh heo her hgb hgc hge hgg hgh hgo hgr hhb hhc hhe hhg hhh hho hhr hob hoc hoe hog hoh hoo hor hr- hrb hrc hre hrg hrh hro hrr ob- obb obc obe obg obh obo obr oc- ocb occ ocg och oco ocr oeb oec oee oeg oeh oeo oer ogc oge ogg ogh ogo ohc ohe ohg ohh oho ohr oo- oob ooc oog ooh ooo oor or- orb orc ore org orh oro orr rbb rbc rbe rbg rbh rbo rbr rcb rcc rce rcg rch rco rcr re- reb rec ree reg reh reo rer rgb rgc rge rgg rgh rgo rgr rh- rhb rhc rhe rhg rhh rho rhr rob roc roe rog roh roo ror rrb rrc rrg rrh rrr