a-a a-c aaa aac aan aao aap aar aas ac- aca acc acn aco acp acr acs an- ana anc ann ano anp anr ans aoa aoc aon aoo aop aor aos ap- apa apc apn apo app apr aps ar- ara arc arn aro arp arr ars as- asa asc asn aso asp asr ass c-- caa cac can cao cap car cas cca ccc ccn cco ccp ccr ccs cn- cna cnc cnn cno cnp cnr cns co- coa coc con coo cop cor cos cpa cpc cpn cpo cpp cpr cps cra crc crn cro crp crr crs csa csc csn cso csp csr css naa nac nan nao nap nar nas nca ncc ncn nco ncp ncr ncs nna nnc nnn nno nnp nns no- noa noc non noo nop nor nos npa npc npn npo npp npr nps nra nrc nrn nro nrp nrr nrs nsa nsc nsn nso nsp nsr nss oaa oac oan oao oap oar oas oc- oca occ ocn oco ocp ocr ocs on- ona onc onn ono onp onr ons oo- ooa ooc oon ooo oop oor oos op- opa opc opn opo opp opr ops or- ora orc orn oro orp orr ors os- osa osc osn oso osp osr oss p-p paa pac pan pao pap par pas pca pcc pcn pco pcp pcr pcs pn- pna pnc pnn pno pnp pnr pns poa poc pon poo pop por pos ppa ppc ppn ppo ppp ppr pps pra prc prn pro prp prr prs ps- psa psc psn pso psp psr pss ra- raa rac ran rao rap rar ras rca rcc rcn rco rcp rcr rcs rna rnc rnn rno rnp rnr rns roa roc ron roo rop ror ros rpa rpc rpn rpo rpp rpr rps rra rrc rrn rrp rrr rrs rsa rsc rsn rso rsp rsr rss saa sac san sao sap sar sas sca scc scn sco scp scr scs sna snc snn sno snp snr sns soa soc son soo sop sor sos spa spc spn spo spp spr sps sr- sra src srn sro srp srr srs ss- ssa ssc ssn sso ssp ssr sss