a-a a-b a-i a-t aaa aab aai aan aap aat ab- aba abb abi abn abp abt ai- aia aib aii ain aip ait an- ana anb ani ann anp ant ap- apa apb api apn app apt at- ata atb ati atn atp att b-p baa bab bai ban bap bat bba bbb bbi bbn bbp bbt bi- bia bib bii bin bip bit bna bnb bni bnn bnp bnt bpa bpb bpi bpn bpp bpt bta btb bti btn btp btt ia- iaa iab iai ian iap iat iba ibb ibi ibn ibp ibt iia iib iii iin iip iit in- ina inb ini inn inp int ipa ipb ipi ipn ipp ipt ita itb iti itn itp itt n-i naa nab nai nan nap nat nba nbb nbi nbn nbp nbt nia nib nii nin nip nit nna nnb nni nnn nnp nnt npa npb npi npn npp npt nta ntb nti ntn ntp ntt p-p paa pab pai pan pap pat pba pbb pbi pbn pbp pbt pia pib pii pin pip pit pn- pna pnb pni pnn pnp pnt ppa ppb ppi ppn ppp ppt pt- pta ptb pti ptn ptp ptt taa tab tai tan tap tat tba tbb tbi tbn tbp tbt tia tib tii tin tip tit tna tnb tni tnn tnp tnt tpa tpb tpi tpn tpp tpt tta ttb tti ttn ttp ttt