c-- ccc cch ccn cco ccz ch- chc chh chn cho chz cn- cnc cnh cnn cno co- coc coh con coo coz cz- czc czo hcc hch hcn hco hhc hhh hhn hho hhz hnc hnh hnn hno hnz hoc hoh hon hoo hzo ncc nch ncn nco nhc nhh nhn nhz nnc nnh nnn nno nnz no- noc noh non noo noz nzo nzz oc- occ och ocn oco ocz ohc ohh ohn oho on- onc onh onn ono oo- ooc ooh oon ooo ozo ozz zco zhc zho znc znn zno zo- zoc zon zoo zzz