-ic a-a a-b a-c a-i a-t aaa aab aac aaf aai aan aao aat ab- aba abb abc abf abi abn abo abt ac- aca acb acc acf aci acn aco act af- afa afb afc aff afi afn afo aft ai- aia aib aic aif aii ain aio ait an- ana anb anc anf ani ann ano ant aoa aob aoc aof aoi aon aoo aot at- ata atb atc atf ati atn ato att baa bab bac baf bai ban bao bat bba bbb bbc bbf bbi bbn bbo bbt bca bcb bcc bcf bci bcn bco bct bfa bfb bfc bff bfi bfn bfo bft bi- bia bib bic bif bii bin bio bit bna bnb bnc bnf bni bnn bno bnt boa bob boc bof boi bon boo bot bta btb btc btf bti btn bto btt c-- caa cab cac caf cai can cao cat cba cbb cbc cbf cbi cbn cbo cbt cca ccb ccc ccf cci ccn cco cct cfa cfb cfc cff cfi cfn cfo cft ci- cia cib cic cif cii cin cio cit cn- cna cnb cnc cnf cni cnn cno cnt co- coa cob coc cof coi con coo cot cta ctb ctc ctf cti ctn cto ctt faa fab fac faf fai fan fao fat fba fbb fbc fbf fbi fbn fbo fbt fca fcb fcc fcf fci fcn fco fct ffa ffc fff ffi ffn ffo fft fia fib fic fif fii fin fit fna fnb fnc fnf fni fnn fnt foa fob foc fof foi fon foo fot fta ftb ftc ftf fti ftn fto ftt i-f ia- iaa iab iac iaf iai ian iao iat iba ibb ibc ibf ibi ibn ibo ibt ica icb icc icf ici icn ico ict ifa ifb ifc iff ifi ifn ifo ift iia iib iic iif iii iin iio iit in- ina inb inc inf ini inn ino int io- ioa iob ioc iof ioi ion ioo iot ita itb itc itf iti itn ito itt n-i naa nab nac naf nai nan nao nat nba nbb nbc nbf nbi nbn nbo nbt nca ncb ncc ncf nci ncn nco nct nfa nfb nfc nff nfi nfn nfo nft nia nib nic nif nii nin nio nit nna nnb nnc nnf nni nnn nno nnt no- noa nob noc nof noi non noo not nta ntb ntc ntf nti ntn nto ntt o-i oaa oab oac oaf oai oan oao oat ob- oba obb obc obf obi obn obo obt oc- oca ocb occ ocf oci ocn oco oct of- ofa ofb ofc off ofi ofn ofo oft oia oib oic oif oii oin oio oit on- ona onb onc onf oni onn ono ont oo- ooa oob ooc oof ooi oon ooo oot ot- ota otb otc otf oti otn oto ott taa tab tac taf tai tan tao tat tba tbb tbc tbf tbi tbn tbo tbt tca tcb tcc tcf tci tcn tco tct tfa tfb tfc tff tfi tfn tfo tft tia tib tic tif tii tin tio tit tna tnb tnc tnf tni tnn tno tnt to- toa tob toc tof toi ton too tot tta ttb ttc ttf tti ttn tto ttt