a-a a-b a-t aaa aab aag aao aap aas aat ab- aba abb abg abo abp abs abt ag- aga agb agg ago agp ags agt aoa aob aog aoo aop aos aot ap- apa apb apg apo app aps apt as- asa asb asg aso asp ass ast at- ata atb atg ato atp ats att b-p baa bab bag bao bap bas bat bba bbb bbg bbo bbp bbs bbt bga bgb bgg bgo bgp bgs bgt boa bob bog boo bop bos bot bpa bpb bpg bpo bpp bps bpt bsa bsb bsg bso bsp bss bst bta btb btg bto btp bts btt g-p gaa gab gag gao gap gas gat gba gbg gbo gbp gbs gbt gga ggb ggg ggo ggp ggs ggt goa gob gog goo gop gos got gpa gpb gpg gpo gpp gps gpt gsa gsb gsg gso gsp gss gst gta gtb gtg gto gtp gts gtt oaa oab oag oao oap oas oat ob- oba obb obg obo obp obs obt oga ogg ogo ogp ogs ogt oo- ooa oob oog ooo oop oos oot op- opa opb opg opo opp ops opt os- osa osb osg oso osp oss ost ot- ota otb otg oto otp ots ott p-p paa pab pag pao pap pas pat pba pbb pbg pbo pbp pbs pbt pga pgb pgg pgo pgp pgs pgt poa pob pog poo pop pos pot ppa ppb ppg ppo ppp pps ppt ps- psa psb psg pso psp pss pst pt- pta ptb ptg pto ptp pts ptt saa sab sag sao sap sas sat sba sbb sbg sbo sbp sbs sbt sga sgb sgg sgo sgp sgs sgt soa sob sog soo sop sos sot spa spb spg spo spp sps spt ss- ssa ssb ssg sso ssp sss sst sta stb stg sto stp sts stt taa tab tag tao tap tas tat tba tbb tbg tbo tbp tbs tbt tga tgb tgg tgo tgp tgs tgt to- toa tob tog too top tos tot tpa tpb tpg tpo tpp tps tpt tsa tsb tsg tso tsp tss tst tta ttb ttg tto ttp tts ttt