bbb bbc bbg bbo bbr bby bcb bcc bcg bco bcr bcy bgb bgc bgg bgo bgr bob boc bog boo bor boy brb brg bro brr bry by- byc byg byo byr c-- cbb cbc cbg cbo cbr cby ccb ccc ccg cco ccr cgb cgc cgg cgo cgr cgy co- cob coc cog coo cor coy crb crc crg cro crr cry cyb cyc cyg cyo cyr gbc gbg gbo gbr gby gcb gcc gcg gco gcr ggb ggc ggg ggo ggr gob goc gog goo gor goy grb grc grg gro grr gry gy- gyb gyo gyr ob- obb obc obg obo obr oby oc- ocb occ ocg oco ocr ogc ogg ogo ogy oo- oob ooc oog ooo oor or- orb orc org oro orr ory oyo rbb rbc rbg rbo rbr rcb rcc rcg rco rcr rgb rgc rgg rgo rgr rob roc rog roo ror roy rrb rrc rrg rrr ry- ryc ryg ryo ryr ryy ybc ybg ybr yby ycc yco ycy ygc ygo yob yoc yog yoo yor yoy yrc yrg yro yyb yyc yyg yyy