a-a a-c aaa aac aae aan aao aap ac- aca acc ace acn aco acp aea aec aee aen aeo aep an- ana anc ane ann ano anp aoa aoc aoe aon aoo aop ap- apa apc ape apn apo app c-- caa cac cae can cao cap cca ccc cce ccn cco ccp ce- cea cec cee cen ceo cep cn- cna cnc cne cnn cno cnp co- coa coc coe con coo cop cpa cpc cpe cpn cpo cpp eaa eac eae ean eao eap ec- eca ecc ece ecn eco eea eec eee een eeo eep en- ena enc ene enn eno enp eo- eoa eoc eoe eon eoo eop ep- epa epc epe epn epo epp naa nac nae nan nao nap nca ncc nce ncn nco ncp ne- nea nec nee nen neo nep nna nnc nne nnn nno nnp no- noa noc noe non noo nop npa npc npe npn npo npp oaa oac oae oan oao oap oc- oca occ ocn oco ocp oea oec oee oen oeo oep on- ona onc one onn ono onp oo- ooa ooc oon ooo oop op- opa opc ope opn opo opp p-p paa pac pae pan pao pap pca pcc pce pcn pco pcp pea pec pee pen peo pep pn- pna pnc pne pnn pno pnp poa poc poe pon poo pop ppa ppc ppe ppn ppo ppp