a-a a-c aaa aac aae aak aan aao aap ac- aca acc ace ack acn aco acp aea aec aee aek aen aeo aep aka akc ake akk akn ako akp an- ana anc ane ank ann ano anp aoa aoc aoe aok aon aoo aop ap- apa apc ape apk apn apo app c-- caa cac cae cak can cao cap cca ccc cce cck ccn cco ccp ce- cea cec cee cek cen ceo cep cka ckc cko cn- cna cnc cne cnn cno cnp co- coa coc coe cok con coo cop cpa cpc cpe cpk cpn cpo cpp eaa eac eae eak ean eao eap ec- eca ecc ece eck ecn eco eea eec eee eek een eeo eep eka ekc eke eko ekp en- ena enc ene enk enn eno enp eo- eoa eoc eoe eok eon eoo eop ep- epa epc epe epn epo epp ka- kaa kac kae kak kan kao kap kca kcc kce kck kcn kcp ke- kea kec kee kek ken keo kep kkc kke kkk kkn kkp kn- kna knc kne knk knn kno knp koa koc koe kok kon koo kop kpa kpc kpe kpk kpn kpo kpp naa nac nae nak nan nao nap nca ncc nce nck ncn nco ncp ne- nea nec nee nek nen neo nep nka nkc nke nkk nkn nko nkp nna nnc nne nnk nnn nno nnp no- noa noc noe nok non noo nop npa npc npe npn npo npp oaa oac oae oak oan oao oap oc- oca occ ock ocn oco ocp oea oec oee oen oeo oep oka okc oke okk oko okp on- ona onc one onk onn ono onp oo- ooa ooc ook oon ooo oop op- opa opc ope opk opn opo opp p-p paa pac pae pak pan pao pap pca pcc pce pck pcn pco pcp pea pec pee pek pen peo pep pka pkc pke pkn pko pkp pn- pna pnc pne pnk pnn pno pnp poa poc poe pok pon poo pop ppa ppc ppe ppk ppn ppo ppp