c-- ccc ccn cco ccp ccr cn- cnc cnn cno cnp cnr co- coc con coo cop cor cpc cpn cpo cpp cpr crc crn cro crp crr ncc ncn nco ncp ncr nnc nnn nno nnp no- noc non noo nop nor npc npn npo npp npr nrc nrn nro nrp nrr oc- occ ocn oco ocp ocr on- onc onn ono onp onr oo- ooc oon ooo oop oor op- opc opn opo opp opr or- orc orn oro orp orr p-p pcc pcn pco pcp pcr pn- pnc pnn pno pnp pnr poc pon poo pop por ppc ppn ppo ppp ppr prc prn pro prp prr rcc rcn rco rcp rcr rnc rnn rno rnp rnr roc ron roo rop ror rpc rpn rpo rpp rpr rrc rrn rrp rrr