bbb bbc bbg bbh bbo bbr bcb bcc bcg bch bco bcr bgb bgc bgg bgh bgo bgr bhb bhc bhg bhh bho bhr bob boc bog boh boo bor brb brg brh bro brr c-- cbb cbc cbg cbh cbo cbr ccb ccc ccg cch cco ccr cgb cgc cgg cgh cgo cgr ch- chb chc chg chh cho chr co- cob coc cog coh coo cor crb crc crg crh cro crr gbc gbg gbh gbo gbr gcb gcc gcg gch gco gcr ggb ggc ggg ggh ggo ggr ghb ghc ghg ghh gho ghr gob goc gog goh goo gor grb grc grg grh gro grr hbb hbc hbg hbh hbo hbr hcb hcc hcg hch hco hcr hgb hgc hgg hgh hgo hgr hhb hhc hhg hhh hho hhr hob hoc hog hoh hoo hor hr- hrb hrc hrg hrh hro hrr ob- obb obc obg obh obo obr oc- ocb occ ocg och oco ocr ogc ogg ogh ogo ohc ohg ohh oho ohr oo- oob ooc oog ooh ooo oor or- orb orc org orh oro orr rbb rbc rbg rbh rbo rbr rcb rcc rcg rch rco rcr rgb rgc rgg rgh rgo rgr rh- rhb rhc rhg rhh rho rhr rob roc rog roh roo ror rrb rrc rrg rrh rrr