a-a a-b aaa aab aad aan aap aas ab- aba abb abd abn abp abs ad- ada adb add adn adp ads an- ana anb and ann anp ans ap- apa apb apd apn app aps as- asa asb asd asn asp ass b-p baa bab bad ban bap bas bba bbb bbd bbn bbp bbs bda bdb bdd bdp bds bna bnb bnd bnn bnp bns bpa bpb bpd bpn bpp bps bsa bsb bsd bsn bsp bss daa dab dad dan dap das dba dbb dbd dbn dbp dbs dda ddb ddd ddn ddp dds dna dnb dnd dnn dnp dns dpa dpb dpd dpn dpp dps dsa dsb dsd dsn dsp dss naa nab nad nan nap nas nba nbb nbd nbn nbp nbs nda ndb ndd ndn ndp nds nna nnb nnn nnp nns npa npb npd npn npp nps nsa nsb nsd nsn nsp nss p-p paa pab pad pan pap pas pba pbb pbd pbn pbp pbs pda pdb pdd pdn pdp pds pn- pna pnb pnd pnn pnp pns ppa ppb ppd ppn ppp pps ps- psa psb psd psn psp pss saa sab sad san sap sas sba sbb sbd sbn sbp sbs sda sdb sdd sdn sdp sds sna snb snd snn snp sns spa spb spd spn spp sps ss- ssa ssb ssd ssn ssp sss