a-a a-b a-t aaa aab aag aao aap aat ab- aba abb abg abo abp abt ag- aga agb agg ago agp agt aoa aob aog aoo aop aot ap- apa apb apg apo app apt at- ata atb atg ato atp att b-p baa bab bag bao bap bat bba bbb bbg bbo bbp bbt bga bgb bgg bgo bgp bgt boa bob bog boo bop bot bpa bpb bpg bpo bpp bpt bta btb btg bto btp btt g-p gaa gab gag gao gap gat gba gbg gbo gbp gbt gga ggb ggg ggo ggp ggt goa gob gog goo gop got gpa gpb gpg gpo gpp gpt gta gtb gtg gto gtp gtt oaa oab oag oao oap oat ob- oba obb obg obo obp obt oga ogg ogo ogp ogt oo- ooa oob oog ooo oop oot op- opa opb opg opo opp opt ot- ota otb otg oto otp ott p-p paa pab pag pao pap pat pba pbb pbg pbo pbp pbt pga pgb pgg pgo pgp pgt poa pob pog poo pop pot ppa ppb ppg ppo ppp ppt pt- pta ptb ptg pto ptp ptt taa tab tag tao tap tat tba tbb tbg tbo tbp tbt tga tgb tgg tgo tgp tgt to- toa tob tog too top tot tpa tpb tpg tpo tpp tpt tta ttb ttg tto ttp ttt