a-a a-t aaa aad aao aap aat ad- ada add ado adp adt aoa aod aoo aop aot ap- apa apd apo app apt at- ata atd ato atp att daa dad dao dap dat dda ddd ddo ddp ddt doa dod doo dop dot dpa dpd dpo dpp dpt dta dtd dto dtp dtt oaa oad oao oap oat oda odd odo odp odt oo- ooa ood ooo oop oot op- opa opd opo opp opt ot- ota otd oto otp ott p-p paa pad pao pap pat pda pdd pdo pdp pdt poa pod poo pop pot ppa ppd ppo ppp ppt pt- pta ptd pto ptp ptt taa tad tao tap tat tda tdd tdo tdp tdt to- toa tod too top tot tpa tpd tpo tpp tpt tta ttd tto ttp ttt