a-a a-b a-i a-t aaa aab aaf aai aan aar aat ab- aba abb abf abi abn abr abt af- afa afb aff afi afn afr aft ai- aia aib aif aii ain air ait an- ana anb anf ani ann anr ant ar- ara arb arf ari arn arr art at- ata atb atf ati atn atr att baa bab baf bai ban bar bat bba bbb bbf bbi bbn bbr bbt bfa bfb bff bfi bfn bfr bft bi- bia bib bif bii bin bir bit bna bnb bnf bni bnn bnr bnt bra brb brf bri brn brr brt bta btb btf bti btn btr btt faa fab faf fai fan far fat fba fbb fbf fbi fbn fbr fbt ffa fff ffi ffn ffr fft fia fib fif fii fin fir fit fna fnb fnf fni fnn fnr fnt fra frb frf fri frn frr frt fta ftb ftf fti ftn ftr ftt i-f ia- iaa iab iaf iai ian iar iat iba ibb ibf ibi ibn ibr ibt ifa ifb iff ifi ifn ifr ift iia iib iif iii iin iir iit in- ina inb inf ini inn inr int ir- ira irb irf iri irn irr irt ita itb itf iti itn itt n-i naa nab naf nai nan nar nat nba nbb nbf nbi nbn nbr nbt nfa nfb nff nfi nfn nfr nft nia nib nif nii nin nir nit nna nnb nnf nni nnn nnt nra nrb nrf nri nrn nrr nrt nta ntb ntf nti ntn ntr ntt ra- raa rab raf rai ran rar rat rba rbb rbf rbi rbn rbr rbt rfa rfb rff rfi rfn rfr rft ria rib rif rii rin rir rit rna rnb rni rnn rnr rnt rra rrb rrf rri rrn rrr rrt rta rtb rtf rti rtn rtr rtt taa tab taf tai tan tar tat tba tbb tbf tbi tbn tbr tbt tfa tfb tff tfi tfn tfr tft tia tib tif tii tin tir tit tna tnb tnf tni tnn tnr tnt tra trb trf tri trn trr trt tta ttb ttf tti ttn ttr ttt