a-a a-c aaa aac aad aan aao aap ac- aca acc acd acn aco acp ad- ada adc add adn ado adp an- ana anc and ann ano anp aoa aoc aod aon aoo aop ap- apa apc apd apn apo app c-- caa cac cad can cao cap cca ccc ccd ccn cco ccp cda cdc cdd cdn cdo cdp cn- cna cnc cnd cnn cno cnp co- coa coc cod con coo cop cpa cpc cpd cpn cpo cpp daa dac dad dan dao dap dca dcc dcd dcn dco dcp dda ddc ddd ddn ddo ddp dna dnc dnd dnn dno dnp doa doc dod don doo dop dpa dpc dpd dpn dpo dpp naa nac nad nan nao nap nca ncc ncd ncn nco ncp nda ndc ndd ndn ndo ndp nna nnc nnn nno nnp no- noa noc nod non noo nop npa npc npd npn npo npp oaa oac oad oan oao oap oc- oca occ ocd ocn oco ocp oda odc odd odn odo odp on- ona onc ond onn ono onp oo- ooa ooc ood oon ooo oop op- opa opc opd opn opo opp p-p paa pac pad pan pao pap pca pcc pcd pcn pco pcp pda pdc pdd pdn pdo pdp pn- pna pnc pnd pnn pno pnp poa poc pod pon poo pop ppa ppc ppd ppn ppo ppp