a-a a-b aaa aab aan aap aas aay ab- aba abb abn abp abs aby an- ana anb ann anp ans any ap- apa apb apn app aps apy as- asa asb asn asp ass asy ay- aya ayn ayp ays b-p baa bab ban bap bas bay bba bbb bbn bbp bbs bby bna bnb bnn bnp bns bpa bpb bpn bpp bps bpy bsa bsb bsn bsp bss bsy by- bya byn byp bys naa nab nan nap nas nay nba nbb nbn nbp nbs nna nnb nnn nnp nns npa npb npn npp nps nsa nsb nsn nsp nss nsy nya nyn nyp nys nyy p-p paa pab pan pap pas pay pba pbb pbn pbp pbs pby pn- pna pnb pnn pnp pns pny ppa ppb ppn ppp pps ps- psa psb psn psp pss psy py- pya pyb pyn pys saa sab san sap sas say sba sbb sbn sbp sbs sby sna snb snn snp sns sny spa spb spn spp sps spy ss- ssa ssb ssn ssp sss sy- sya syb syn syp sys yaa yab yan yap yas yay ybp ybs yby yna ynn ynp yns yny ypa yps ysa ysb ysp yss ysy yyb yys yyy