c-- ccc ccn cco ccp ccr ccs cn- cnc cnn cno cnp cnr cns co- coc con coo cop cor cos cpc cpn cpo cpp cpr cps crc crn cro crp crr crs csc csn cso csp csr css ncc ncn nco ncp ncr ncs nnc nnn nno nnp nns no- noc non noo nop nor nos npc npn npo npp npr nps nrc nrn nro nrp nrr nrs nsc nsn nso nsp nsr nss oc- occ ocn oco ocp ocr ocs on- onc onn ono onp onr ons oo- ooc oon ooo oop oor oos op- opc opn opo opp opr ops or- orc orn oro orp orr ors os- osc osn oso osp osr oss p-p pcc pcn pco pcp pcr pcs pn- pnc pnn pno pnp pnr pns poc pon poo pop por pos ppc ppn ppo ppp ppr pps prc prn pro prp prr prs ps- psc psn pso psp psr pss rcc rcn rco rcp rcr rcs rnc rnn rno rnp rnr rns roc ron roo rop ror ros rpc rpn rpo rpp rpr rps rrc rrn rrp rrr rrs rsc rsn rso rsp rsr rss scc scn sco scp scr scs snc snn sno snp snr sns soc son soo sop sor sos spc spn spo spp spr sps sr- src srn sro srp srr srs ss- ssc ssn sso ssp ssr sss