a-a a-c aaa aac aan aao aap aar ac- aca acc acn aco acp acr an- ana anc ann ano anp anr aoa aoc aon aoo aop aor ap- apa apc apn apo app apr ar- ara arc arn aro arp arr c-- caa cac can cao cap car cca ccc ccn cco ccp ccr cn- cna cnc cnn cno cnp cnr co- coa coc con coo cop cor cpa cpc cpn cpo cpp cpr cra crc crn cro crp crr naa nac nan nao nap nar nca ncc ncn nco ncp ncr nna nnc nnn nno nnp no- noa noc non noo nop nor npa npc npn npo npp npr nra nrc nrn nro nrp nrr oaa oac oan oao oap oar oc- oca occ ocn oco ocp ocr on- ona onc onn ono onp onr oo- ooa ooc oon ooo oop oor op- opa opc opn opo opp opr or- ora orc orn oro orp orr p-p paa pac pan pao pap par pca pcc pcn pco pcp pcr pn- pna pnc pnn pno pnp pnr poa poc pon poo pop por ppa ppc ppn ppo ppp ppr pra prc prn pro prp prr ra- raa rac ran rao rap rar rca rcc rcn rco rcp rcr rna rnc rnn rno rnp rnr roa roc ron roo rop ror rpa rpc rpn rpo rpp rpr rra rrc rrn rrp rrr