a-a a-c aaa aac aan aap aar aas ac- aca acc acn acp acr acs an- ana anc ann anp anr ans ap- apa apc apn app apr aps ar- ara arc arn arp arr ars as- asa asc asn asp asr ass c-- caa cac can cap car cas cca ccc ccn ccp ccr ccs cn- cna cnc cnn cnp cnr cns cpa cpc cpn cpp cpr cps cra crc crn crp crr crs csa csc csn csp csr css naa nac nan nap nar nas nca ncc ncn ncp ncr ncs nna nnc nnn nnp nns npa npc npn npp npr nps nra nrc nrn nrp nrr nrs nsa nsc nsn nsp nsr nss p-p paa pac pan pap par pas pca pcc pcn pcp pcr pcs pn- pna pnc pnn pnp pnr pns ppa ppc ppn ppp ppr pps pra prc prn prp prr prs ps- psa psc psn psp psr pss ra- raa rac ran rap rar ras rca rcc rcn rcp rcr rcs rna rnc rnn rnp rnr rns rpa rpc rpn rpp rpr rps rra rrc rrn rrp rrr rrs rsa rsc rsn rsp rsr rss saa sac san sap sar sas sca scc scn scp scr scs sna snc snn snp snr sns spa spc spn spp spr sps sr- sra src srn srp srr srs ss- ssa ssc ssn ssp ssr sss