a-a a-b a-i a-t aaa aab aai aan aap aas aat ab- aba abb abi abn abp abs abt ai- aia aib aii ain aip ais ait an- ana anb ani ann anp ans ant ap- apa apb api apn app aps apt as- asa asb asi asn asp ass ast at- ata atb ati atn atp ats att b-p baa bab bai ban bap bas bat bba bbb bbi bbn bbp bbs bbt bi- bia bib bii bin bip bis bit bna bnb bni bnn bnp bns bnt bpa bpb bpi bpn bpp bps bpt bsa bsb bsi bsn bsp bss bst bta btb bti btn btp bts btt ia- iaa iab iai ian iap ias iat iba ibb ibi ibn ibp ibs ibt iia iib iii iin iip iis iit in- ina inb ini inn inp ins int ipa ipb ipi ipn ipp ips ipt is- isa isb isi isn isp iss ist ita itb iti itn itp its itt n-i naa nab nai nan nap nas nat nba nbb nbi nbn nbp nbs nbt nia nib nii nin nip nis nit nna nnb nni nnn nnp nns nnt npa npb npi npn npp nps npt nsa nsb nsi nsn nsp nss nst nta ntb nti ntn ntp nts ntt p-p paa pab pai pan pap pas pat pba pbb pbi pbn pbp pbs pbt pia pib pii pin pip pis pit pn- pna pnb pni pnn pnp pns pnt ppa ppb ppi ppn ppp pps ppt ps- psa psb psi psn psp pss pst pt- pta ptb pti ptn ptp pts ptt saa sab sai san sap sas sat sba sbb sbi sbn sbp sbs sbt sia sib sii sin sip sis sit sna snb sni snn snp sns snt spa spb spi spn spp sps spt ss- ssa ssb ssi ssn ssp sss sst sta stb sti stn stp sts stt taa tab tai tan tap tas tat tba tbb tbi tbn tbp tbs tbt tia tib tii tin tip tis tit tna tnb tni tnn tnp tns tnt tpa tpb tpi tpn tpp tps tpt tsa tsb tsi tsn tsp tss tst tta ttb tti ttn ttp tts ttt