a-a a-b a-i a-t aaa aab aaf aai aan aao aar aat ab- aba abb abf abi abn abo abr abt af- afa afb aff afi afn afo afr aft ai- aia aib aif aii ain aio air ait an- ana anb anf ani ann ano anr ant aoa aob aof aoi aon aoo aor aot ar- ara arb arf ari arn aro arr art at- ata atb atf ati atn ato atr att baa bab baf bai ban bao bar bat bba bbb bbf bbi bbn bbo bbr bbt bfa bfb bff bfi bfn bfo bfr bft bi- bia bib bif bii bin bio bir bit bna bnb bnf bni bnn bno bnr bnt boa bob bof boi bon boo bor bot bra brb brf bri brn bro brr brt bta btb btf bti btn bto btr btt faa fab faf fai fan fao far fat fba fbb fbf fbi fbn fbo fbr fbt ffa fff ffi ffn ffo ffr fft fia fib fif fii fin fir fit fna fnb fnf fni fnn fnr fnt foa fob fof foi fon foo for fot fra frb frf fri frn fro frr frt fta ftb ftf fti ftn fto ftr ftt i-f ia- iaa iab iaf iai ian iao iar iat iba ibb ibf ibi ibn ibo ibr ibt ifa ifb iff ifi ifn ifo ifr ift iia iib iif iii iin iio iir iit in- ina inb inf ini inn ino inr int io- ioa iob iof ioi ion ioo ior iot ir- ira irb irf iri irn iro irr irt ita itb itf iti itn ito itt n-i naa nab naf nai nan nao nar nat nba nbb nbf nbi nbn nbo nbr nbt nfa nfb nff nfi nfn nfo nfr nft nia nib nif nii nin nio nir nit nna nnb nnf nni nnn nno nnt no- noa nob nof noi non noo nor not nra nrb nrf nri nrn nro nrr nrt nta ntb ntf nti ntn nto ntr ntt o-i oaa oab oaf oai oan oao oar oat ob- oba obb obf obi obn obo obr obt of- ofa ofb off ofi ofn ofo ofr oft oia oib oif oii oin oio oir oit on- ona onb onf oni onn ono onr ont oo- ooa oob oof ooi oon ooo oor oot or- ora orb orf ori orn oro orr ort ot- ota otb otf oti otn oto otr ott ra- raa rab raf rai ran rao rar rat rba rbb rbf rbi rbn rbo rbr rbt rfa rfb rff rfi rfn rfo rfr rft ria rib rif rii rin rio rir rit rna rnb rni rnn rno rnr rnt roa rob rof roi ron roo ror rot rra rrb rrf rri rrn rrr rrt rta rtb rtf rti rtn rto rtr rtt taa tab taf tai tan tao tar tat tba tbb tbf tbi tbn tbo tbr tbt tfa tfb tff tfi tfn tfo tfr tft tia tib tif tii tin tio tir tit tna tnb tnf tni tnn tno tnr tnt to- toa tob tof toi ton too tor tot tra trb trf tri trn tro trr trt tta ttb ttf tti ttn tto ttr ttt