c-- ccc ccp ccr ccs cpc cpp cpq cpr cps cqc cqs crc crp crq crr crs csc csp csq csr css p-p pcc pcp pcq pcr pcs ppc ppp ppq ppr pps pqq pqr pqs prc prp prq prr prs ps- psc psp psr pss qcc qcp qcs qpc qpp qpr qps qqq qrc qrp qrs qsc qsp qsr rcc rcp rcr rcs rpc rpp rpr rps rqc rqs rrc rrp rrq rrr rrs rsc rsp rsq rsr rss scc scp scr scs spc spp spq spr sps sqq sqr sqs sr- src srp srq srr srs ss- ssc ssp ssq ssr sss