a-a a-b a-t aaa aab aad aao aap aat ab- aba abb abd abo abp abt ad- ada adb add ado adp adt aoa aob aod aoo aop aot ap- apa apb apd apo app apt at- ata atb atd ato atp att b-p baa bab bad bao bap bat bba bbb bbd bbo bbp bbt bda bdb bdd bdo bdp bdt boa bob bod boo bop bot bpa bpb bpd bpo bpp bpt bta btb btd bto btp btt daa dab dad dao dap dat dba dbb dbd dbo dbp dbt dda ddb ddd ddo ddp ddt doa dob dod doo dop dot dpa dpb dpd dpo dpp dpt dta dtb dtd dto dtp dtt oaa oab oad oao oap oat ob- oba obb obd obo obp obt oda odb odd odo odp odt oo- ooa oob ood ooo oop oot op- opa opb opd opo opp opt ot- ota otb otd oto otp ott p-p paa pab pad pao pap pat pba pbb pbd pbo pbp pbt pda pdb pdd pdo pdp pdt poa pob pod poo pop pot ppa ppb ppd ppo ppp ppt pt- pta ptb ptd pto ptp ptt taa tab tad tao tap tat tba tbb tbd tbo tbp tbt tda tdb tdd tdo tdp tdt to- toa tob tod too top tot tpa tpb tpd tpo tpp tpt tta ttb ttd tto ttp ttt