c-- ccc cch cco ccr ch- chc chh cho chr chy co- coc coh coo cor coy crc crh cro crr cry cyc cyo cyr hcc hch hco hcr hcy hhc hhh hho hhr hhy hoc hoh hoo hor hoy hr- hrc hrh hro hrr hy- hyc hyh hyo hyr hyy oc- occ och oco ocr ohc ohh oho ohr oo- ooc ooh ooo oor or- orc orh oro orr ory oyo rcc rch rco rcr rh- rhc rhh rho rhr roc roh roo ror roy rrc rrh rrr ry- ryc ryo ryr ryy ycc ych yco ycy yhc yoc yoo yor yoy yrc yro yyc yyy