c-- ccc cch ccn cco ccp ch- chc chh chn cho chp cn- cnc cnh cnn cno cnp co- coc coh con coo cop cpc cph cpn cpo cpp hcc hch hcn hco hcp hhc hhh hhn hho hhp hnc hnh hnn hno hoc hoh hon hoo hop hpc hph hpn hpo hpp ncc nch ncn nco ncp nhc nhh nhn nhp nnc nnh nnn nno nnp no- noc noh non noo nop npc nph npn npo npp oc- occ och ocn oco ocp ohc ohh ohn oho ohp on- onc onh onn ono onp oo- ooc ooh oon ooo oop op- opc oph opn opo opp p-p pcc pch pcn pco pcp phc phn pho php pn- pnc pnh pnn pno pnp poc poh pon poo pop ppc pph ppn ppo ppp