-ic a-a a-b a-c a-i a-t aaa aab aac aai aan aao aat ab- aba abb abc abi abn abo abt ac- aca acb acc aci acn aco act ai- aia aib aic aii ain aio ait an- ana anb anc ani ann ano ant aoa aob aoc aoi aon aoo aot at- ata atb atc ati atn ato att baa bab bac bai ban bao bat bba bbb bbc bbi bbn bbo bbt bca bcb bcc bci bcn bco bct bi- bia bib bic bii bin bio bit bna bnb bnc bni bnn bno bnt boa bob boc boi bon boo bot bta btb btc bti btn bto btt c-- caa cab cac cai can cao cat cba cbb cbc cbi cbn cbo cbt cca ccb ccc cci ccn cco cct ci- cia cib cic cii cin cio cit cn- cna cnb cnc cni cnn cno cnt co- coa cob coc coi con coo cot cta ctb ctc cti ctn cto ctt ia- iaa iab iac iai ian iao iat iba ibb ibc ibi ibn ibo ibt ica icb icc ici icn ico ict iia iib iic iii iin iio iit in- ina inb inc ini inn ino int io- ioa iob ioc ioi ion ioo iot ita itb itc iti itn ito itt n-i naa nab nac nai nan nao nat nba nbb nbc nbi nbn nbo nbt nca ncb ncc nci ncn nco nct nia nib nic nii nin nio nit nna nnb nnc nni nnn nno nnt no- noa nob noc noi non noo not nta ntb ntc nti ntn nto ntt o-i oaa oab oac oai oan oao oat ob- oba obb obc obi obn obo obt oc- oca ocb occ oci ocn oco oct oia oib oic oii oin oio oit on- ona onb onc oni onn ono ont oo- ooa oob ooc ooi oon ooo oot ot- ota otb otc oti otn oto ott taa tab tac tai tan tao tat tba tbb tbc tbi tbn tbo tbt tca tcb tcc tci tcn tco tct tia tib tic tii tin tio tit tna tnb tnc tni tnn tno tnt to- toa tob toc toi ton too tot tta ttb ttc tti ttn tto ttt