c-- ccc cch cco ccp ccr ch- chc chh cho chp chr co- coc coh coo cop cor cpc cph cpo cpp cpr crc crh cro crp crr hcc hch hco hcp hcr hhc hhh hho hhp hhr hoc hoh hoo hop hor hpc hph hpo hpp hpr hr- hrc hrh hro hrp hrr oc- occ och oco ocp ocr ohc ohh oho ohp ohr oo- ooc ooh ooo oop oor op- opc oph opo opp opr or- orc orh oro orp orr p-p pcc pch pco pcp pcr phc pho php phr poc poh poo pop por ppc pph ppo ppp ppr prc prh pro prp prr rcc rch rco rcp rcr rh- rhc rhh rho rhp rhr roc roh roo rop ror rpc rph rpo rpp rpr rrc rrh rrp rrr