a-a a-b a-t aaa aab aan aap aas aat aay ab- aba abb abn abp abs abt aby an- ana anb ann anp ans ant any ap- apa apb apn app aps apt apy as- asa asb asn asp ass ast asy at- ata atb atn atp ats att ay- aya ayn ayp ays ayt b-p baa bab ban bap bas bat bay bba bbb bbn bbp bbs bbt bby bna bnb bnn bnp bns bnt bpa bpb bpn bpp bps bpt bpy bsa bsb bsn bsp bss bst bsy bta btb btn btp bts btt bty by- bya byn byp bys byt naa nab nan nap nas nat nay nba nbb nbn nbp nbs nbt nna nnb nnn nnp nns nnt npa npb npn npp nps npt nsa nsb nsn nsp nss nst nsy nta ntb ntn ntp nts ntt nya nyn nyp nys nyt nyy p-p paa pab pan pap pas pat pay pba pbb pbn pbp pbs pbt pby pn- pna pnb pnn pnp pns pnt pny ppa ppb ppn ppp pps ppt ps- psa psb psn psp pss pst psy pt- pta ptb ptn ptp pts ptt pty py- pya pyb pyn pys pyt saa sab san sap sas sat say sba sbb sbn sbp sbs sbt sby sna snb snn snp sns snt sny spa spb spn spp sps spt spy ss- ssa ssb ssn ssp sss sst sta stb stn stp sts stt sty sy- sya syb syn syp sys syt taa tab tan tap tas tat tay tba tbb tbn tbp tbs tbt tna tnb tnn tnp tns tnt tpa tpb tpn tpp tps tpt tsa tsb tsn tsp tss tst tsy tta ttb ttn ttp tts ttt tty tya tyn typ tys tyt yaa yab yan yap yas yat yay ybp ybs yby yna ynn ynp yns yny ypa yps ysa ysb ysp yss yst ysy yta ytn ytp yts ytt yyb yys yyt yyy