a-a a-t aaa aaf aan aap aat af- afa aff afn afp aft an- ana anf ann anp ant ap- apa apf apn app apt at- ata atf atn atp att faa faf fan fap fat ffa fff ffn ffp fft fna fnf fnn fnp fnt fpa fpn fpp fpt fta ftf ftn ftp ftt naa naf nan nap nat nfa nff nfn nfp nft nna nnf nnn nnp nnt npa npf npn npp npt nta ntf ntn ntp ntt p-p paa paf pan pap pat pfa pff pfn pfp pft pn- pna pnf pnn pnp pnt ppa ppf ppn ppp ppt pt- pta ptf ptn ptp ptt taa taf tan tap tat tfa tff tfn tfp tft tna tnf tnn tnp tnt tpa tpf tpn tpp tpt tta ttf ttn ttp ttt