a-a aaa aad aaf aan aao aap ad- ada add adf adn ado adp af- afa afd aff afn afo afp an- ana and anf ann ano anp aoa aod aof aon aoo aop ap- apa apd apf apn apo app daa dad daf dan dao dap dda ddd ddf ddn ddo ddp dfa dfd dff dfn dfo dfp dna dnd dnf dnn dno dnp doa dod dof don doo dop dpa dpd dpf dpn dpo dpp faa fad faf fan fao fap fda fdd fdf fdn fdo fdp ffa ffd fff ffn ffo ffp fna fnd fnf fnn fnp foa fof fon foo fop fpa fpd fpn fpo fpp naa nad naf nan nao nap nda ndd ndf ndn ndo ndp nfa nfd nff nfn nfo nfp nna nnf nnn nno nnp no- noa nod nof non noo nop npa npd npf npn npo npp oaa oad oaf oan oao oap oda odd odf odn odo odp of- ofa ofd off ofn ofo ofp on- ona ond onf onn ono onp oo- ooa ood oof oon ooo oop op- opa opd opf opn opo opp p-p paa pad paf pan pao pap pda pdd pdf pdn pdo pdp pfa pfd pff pfn pfo pfp pn- pna pnd pnf pnn pno pnp poa pod pof pon poo pop ppa ppd ppf ppn ppo ppp