a-a a-b a-i a-t aaa aab aai aan aap aar aat ab- aba abb abi abn abp abr abt ai- aia aib aii ain aip air ait an- ana anb ani ann anp anr ant ap- apa apb api apn app apr apt ar- ara arb ari arn arp arr art at- ata atb ati atn atp atr att b-p baa bab bai ban bap bar bat bba bbb bbi bbn bbp bbr bbt bi- bia bib bii bin bip bir bit bna bnb bni bnn bnp bnr bnt bpa bpb bpi bpn bpp bpr bpt bra brb bri brn brp brr brt bta btb bti btn btp btr btt ia- iaa iab iai ian iap iar iat iba ibb ibi ibn ibp ibr ibt iia iib iii iin iip iir iit in- ina inb ini inn inp inr int ipa ipb ipi ipn ipp ipr ipt ir- ira irb iri irn irp irr irt ita itb iti itn itp itt n-i naa nab nai nan nap nar nat nba nbb nbi nbn nbp nbr nbt nia nib nii nin nip nir nit nna nnb nni nnn nnp nnt npa npb npi npn npp npr npt nra nrb nri nrn nrp nrr nrt nta ntb nti ntn ntp ntr ntt p-p paa pab pai pan pap par pat pba pbb pbi pbn pbp pbr pbt pia pib pii pin pip pir pit pn- pna pnb pni pnn pnp pnr pnt ppa ppb ppi ppn ppp ppr ppt pra prb pri prn prp prr prt pt- pta ptb pti ptn ptp ptr ptt ra- raa rab rai ran rap rar rat rba rbb rbi rbn rbp rbr rbt ria rib rii rin rip rir rit rna rnb rni rnn rnp rnr rnt rpa rpb rpi rpn rpp rpr rpt rra rrb rri rrn rrp rrr rrt rta rtb rti rtn rtp rtr rtt taa tab tai tan tap tar tat tba tbb tbi tbn tbp tbr tbt tia tib tii tin tip tir tit tna tnb tni tnn tnp tnr tnt tpa tpb tpi tpn tpp tpr tpt tra trb tri trn trp trr trt tta ttb tti ttn ttp ttr ttt