a-a a-t aaa aad aan aap aat ad- ada add adn adp adt an- ana and ann anp ant ap- apa apd apn app apt at- ata atd atn atp att daa dad dan dap dat dda ddd ddn ddp ddt dna dnd dnn dnp dnt dpa dpd dpn dpp dpt dta dtd dtn dtp dtt naa nad nan nap nat nda ndd ndn ndp ndt nna nnn nnp nnt npa npd npn npp npt nta ntd ntn ntp ntt p-p paa pad pan pap pat pda pdd pdn pdp pdt pn- pna pnd pnn pnp pnt ppa ppd ppn ppp ppt pt- pta ptd ptn ptp ptt taa tad tan tap tat tda tdd tdn tdp tdt tna tnd tnn tnp tnt tpa tpd tpn tpp tpt tta ttd ttn ttp ttt