a-a a-b a-i a-t aaa aab aaf aai aan aap aar aat ab- aba abb abf abi abn abp abr abt af- afa afb aff afi afn afp afr aft ai- aia aib aif aii ain aip air ait an- ana anb anf ani ann anp anr ant ap- apa apb apf api apn app apr apt ar- ara arb arf ari arn arp arr art at- ata atb atf ati atn atp atr att b-p baa bab baf bai ban bap bar bat bba bbb bbf bbi bbn bbp bbr bbt bfa bfb bff bfi bfn bfp bfr bft bi- bia bib bif bii bin bip bir bit bna bnb bnf bni bnn bnp bnr bnt bpa bpb bpf bpi bpn bpp bpr bpt bra brb brf bri brn brp brr brt bta btb btf bti btn btp btr btt faa fab faf fai fan fap far fat fba fbb fbf fbi fbn fbp fbr fbt ffa fff ffi ffn ffp ffr fft fia fib fif fii fin fip fir fit fna fnb fnf fni fnn fnp fnr fnt fpa fpb fpi fpn fpp fpr fpt fra frb frf fri frn frp frr frt fta ftb ftf fti ftn ftp ftr ftt i-f ia- iaa iab iaf iai ian iap iar iat iba ibb ibf ibi ibn ibp ibr ibt ifa ifb iff ifi ifn ifp ifr ift iia iib iif iii iin iip iir iit in- ina inb inf ini inn inp inr int ipa ipb ipf ipi ipn ipp ipr ipt ir- ira irb irf iri irn irp irr irt ita itb itf iti itn itp itt n-i naa nab naf nai nan nap nar nat nba nbb nbf nbi nbn nbp nbr nbt nfa nfb nff nfi nfn nfp nfr nft nia nib nif nii nin nip nir nit nna nnb nnf nni nnn nnp nnt npa npb npf npi npn npp npr npt nra nrb nrf nri nrn nrp nrr nrt nta ntb ntf nti ntn ntp ntr ntt p-p paa pab paf pai pan pap par pat pba pbb pbf pbi pbn pbp pbr pbt pfa pfb pff pfi pfn pfp pfr pft pia pib pif pii pin pip pir pit pn- pna pnb pnf pni pnn pnp pnr pnt ppa ppb ppf ppi ppn ppp ppr ppt pra prb prf pri prn prp prr prt pt- pta ptb ptf pti ptn ptp ptr ptt ra- raa rab raf rai ran rap rar rat rba rbb rbf rbi rbn rbp rbr rbt rfa rfb rff rfi rfn rfp rfr rft ria rib rif rii rin rip rir rit rna rnb rni rnn rnp rnr rnt rpa rpb rpf rpi rpn rpp rpr rpt rra rrb rrf rri rrn rrp rrr rrt rta rtb rtf rti rtn rtp rtr rtt taa tab taf tai tan tap tar tat tba tbb tbf tbi tbn tbp tbr tbt tfa tfb tff tfi tfn tfp tfr tft tia tib tif tii tin tip tir tit tna tnb tnf tni tnn tnp tnr tnt tpa tpb tpf tpi tpn tpp tpr tpt tra trb trf tri trn trp trr trt tta ttb ttf tti ttn ttp ttr ttt