a-a a-c aaa aac aan aap aar ac- aca acc acn acp acr an- ana anc ann anp anr ap- apa apc apn app apr ar- ara arc arn arp arr c-- caa cac can cap car cca ccc ccn ccp ccr cn- cna cnc cnn cnp cnr cpa cpc cpn cpp cpr cra crc crn crp crr naa nac nan nap nar nca ncc ncn ncp ncr nna nnc nnn nnp npa npc npn npp npr nra nrc nrn nrp nrr p-p paa pac pan pap par pca pcc pcn pcp pcr pn- pna pnc pnn pnp pnr ppa ppc ppn ppp ppr pra prc prn prp prr ra- raa rac ran rap rar rca rcc rcn rcp rcr rna rnc rnn rnp rnr rpa rpc rpn rpp rpr rra rrc rrn rrp rrr