a-a a-c aaa aac aae aak aan aao ac- aca acc ace ack acn aco aea aec aee aek aen aeo aka akc ake akk akn ako an- ana anc ane ank ann ano aoa aoc aoe aok aon aoo c-- caa cac cae cak can cao cca ccc cce cck ccn cco ce- cea cec cee cek cen ceo cka ckc cko cn- cna cnc cne cnn cno co- coa coc coe cok con coo eaa eac eae eak ean eao ec- eca ecc ece eck ecn eco eea eec eee eek een eeo eka ekc eke eko en- ena enc ene enk enn eno eo- eoa eoc eoe eok eon eoo ka- kaa kac kae kak kan kao kca kcc kce kck kcn ke- kea kec kee kek ken keo kkc kke kkk kkn kn- kna knc kne knk knn kno koa koc koe kok kon koo naa nac nae nak nan nao nca ncc nce nck ncn nco ne- nea nec nee nek nen neo nka nkc nke nkk nkn nko nna nnc nne nnk nnn nno no- noa noc noe nok non noo oaa oac oae oak oan oao oc- oca occ ock ocn oco oea oec oee oen oeo oka okc oke okk oko on- ona onc one onk onn ono oo- ooa ooc ook oon ooo