a-a a-b a-t aaa aab aan aao aap aat ab- aba abb abn abo abp abt an- ana anb ann ano anp ant aoa aob aon aoo aop aot ap- apa apb apn apo app apt at- ata atb atn ato atp att b-p baa bab ban bao bap bat bba bbb bbn bbo bbp bbt bna bnb bnn bno bnp bnt boa bob bon boo bop bot bpa bpb bpn bpo bpp bpt bta btb btn bto btp btt naa nab nan nao nap nat nba nbb nbn nbo nbp nbt nna nnb nnn nno nnp nnt no- noa nob non noo nop not npa npb npn npo npp npt nta ntb ntn nto ntp ntt oaa oab oan oao oap oat ob- oba obb obn obo obp obt on- ona onb onn ono onp ont oo- ooa oob oon ooo oop oot op- opa opb opn opo opp opt ot- ota otb otn oto otp ott p-p paa pab pan pao pap pat pba pbb pbn pbo pbp pbt pn- pna pnb pnn pno pnp pnt poa pob pon poo pop pot ppa ppb ppn ppo ppp ppt pt- pta ptb ptn pto ptp ptt taa tab tan tao tap tat tba tbb tbn tbo tbp tbt tna tnb tnn tno tnp tnt to- toa tob ton too top tot tpa tpb tpn tpo tpp tpt tta ttb ttn tto ttp ttt