a-a a-b a-i a-t aaa aab aaf aai aak aan aao aar aat ab- aba abb abf abi abk abn abo abr abt af- afa afb aff afi afk afn afo afr aft ai- aia aib aif aii aik ain aio air ait aka akb aki akk akn ako akr an- ana anb anf ani ank ann ano anr ant aoa aob aof aoi aok aon aoo aor aot ar- ara arb arf ari ark arn aro arr art at- ata atb atf ati atn ato atr att baa bab baf bai bak ban bao bar bat bba bbb bbf bbi bbk bbn bbo bbr bbt bfa bfb bff bfi bfn bfo bfr bft bi- bia bib bif bii bik bin bio bir bit bka bkb bkf bkk bkn bko bkr bkt bna bnb bnf bni bnk bnn bno bnr bnt boa bob bof boi bok bon boo bor bot bra brb brf bri brk brn bro brr brt bta btb btf bti btk btn bto btr btt faa fab faf fai fak fan fao far fat fba fbb fbf fbi fbk fbn fbo fbr fbt ffa fff ffi ffk ffn ffo ffr fft fia fib fif fii fik fin fir fit fka fkb fkf fki fkk fkt fna fnb fnf fni fnk fnn fnr fnt foa fob fof foi fok fon foo for fot fra frb frf fri frk frn fro frr frt fta ftb ftf fti ftk ftn fto ftr ftt i-f ia- iaa iab iaf iai ian iao iar iat iba ibb ibf ibi ibk ibn ibo ibr ibt ifa ifb iff ifi ifn ifo ifr ift iia iib iif iii iin iio iir iit ika ikb ikf iki ikk iko ikr ikt in- ina inb inf ini ink inn ino inr int io- ioa iob iof ioi ion ioo ior iot ir- ira irb irf iri irk irn iro irr irt ita itb itf iti itk itn ito itt k-t ka- kaa kab kaf kai kak kan kao kar kat kba kbb kbf kbi kbk kbn kbo kbr kfa kff kfi kfo kia kib kif kii kik kin kio kir kit kkb kki kkk kkn kkr kkt kn- kna knf kni knk knn kno knr knt koa kob kof koi kok kon koo kor kot kra krf kri krk krn kro krr krt kta ktb ktf ktk ktn kto ktr ktt n-i naa nab naf nai nak nan nao nar nat nba nbb nbf nbi nbk nbn nbo nbr nbt nfa nfb nff nfi nfk nfn nfo nfr nft nia nib nif nii nik nin nio nir nit nka nkf nki nkk nkn nko nkr nkt nna nnb nnf nni nnk nnn nno nnt no- noa nob nof noi nok non noo nor not nra nrb nrf nri nrk nrn nro nrr nrt nta ntb ntf nti ntk ntn nto ntr ntt o-i oaa oab oaf oai oak oan oao oar oat ob- oba obb obf obi obk obn obo obr obt of- ofa ofb off ofi ofn ofo ofr oft oia oib oif oii oik oin oio oir oit oka okb oki okk oko okr on- ona onb onf oni onk onn ono onr ont oo- ooa oob oof ooi ook oon ooo oor oot or- ora orb orf ori ork orn oro orr ort ot- ota otb otf oti otk otn oto otr ott ra- raa rab raf rai rak ran rao rar rat rba rbb rbf rbi rbk rbn rbo rbr rbt rfa rfb rff rfi rfk rfn rfo rfr rft ria rib rif rii rik rin rio rir rit rkb rkf rkk rko rkt rna rnb rni rnn rno rnr rnt roa rob rof roi rok ron roo ror rot rra rrb rrf rri rrk rrn rrr rrt rta rtb rtf rti rtk rtn rto rtr rtt taa tab taf tai tak tan tao tar tat tba tbb tbf tbi tbk tbn tbo tbr tbt tfa tfb tff tfi tfk tfn tfo tfr tft tia tib tif tii tik tin tio tir tit tka tkb tkk tko tkr tkt tna tnb tnf tni tnk tnn tno tnr tnt to- toa tob tof toi tok ton too tor tot tra trb trf tri trk trn tro trr trt tta ttb ttf tti ttk ttn tto ttr ttt