a-a a-c aaa aac aak aan aao aap ac- aca acc ack acn aco acp aka akc akk akn ako akp an- ana anc ank ann ano anp aoa aoc aok aon aoo aop ap- apa apc apk apn apo app c-- caa cac cak can cao cap cca ccc cck ccn cco ccp cka ckc cko cn- cna cnc cnn cno cnp co- coa coc cok con coo cop cpa cpc cpk cpn cpo cpp ka- kaa kac kak kan kao kap kca kcc kck kcn kcp kkc kkk kkn kkp kn- kna knc knk knn kno knp koa koc kok kon koo kop kpa kpc kpk kpn kpo kpp naa nac nak nan nao nap nca ncc nck ncn nco ncp nka nkc nkk nkn nko nkp nna nnc nnk nnn nno nnp no- noa noc nok non noo nop npa npc npn npo npp oaa oac oak oan oao oap oc- oca occ ock ocn oco ocp oka okc okk oko okp on- ona onc onk onn ono onp oo- ooa ooc ook oon ooo oop op- opa opc opk opn opo opp p-p paa pac pak pan pao pap pca pcc pck pcn pco pcp pka pkc pkn pko pkp pn- pna pnc pnk pnn pno pnp poa poc pok pon poo pop ppa ppc ppk ppn ppo ppp