c-- ccc ccg cco ccr cgc cgg cgo cgr cgy co- coc cog coo cor coy crc crg cro crr cry cyc cyg cyo cyr gcc gcg gco gcr ggc ggg ggo ggr goc gog goo gor goy grc grg gro grr gry gy- gyo gyr oc- occ ocg oco ocr ogc ogg ogo ogy oo- ooc oog ooo oor or- orc org oro orr ory oyo rcc rcg rco rcr rgc rgg rgo rgr roc rog roo ror roy rrc rrg rrr ry- ryc ryg ryo ryr ryy ycc yco ycy ygc ygo yoc yog yoo yor yoy yrc yrg yro yyc yyg yyy