-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aan aao aat ab- aba abb abc abe abi abn abo abt ac- aca acb acc ace aci acn aco act aea aeb aec aee aei aen aeo aet ai- aia aib aic aie aii ain aio ait an- ana anb anc ane ani ann ano ant aoa aob aoc aoe aoi aon aoo aot at- ata atb atc ate ati atn ato att baa bab bac bae bai ban bao bat bba bbb bbc bbe bbi bbn bbo bbt bca bcb bcc bce bci bcn bco bct be- bea beb bec bee bei ben beo bet bi- bia bib bic bie bii bin bio bit bna bnb bnc bne bni bnn bno bnt boa bob boc boe boi bon boo bot bta btb btc bte bti btn bto btt c-- caa cab cac cae cai can cao cat cba cbb cbc cbe cbi cbn cbo cbt cca ccb ccc cce cci ccn cco cct ce- cea ceb cec cee cei cen ceo cet ci- cia cib cic cie cii cin cio cit cn- cna cnb cnc cne cni cnn cno cnt co- coa cob coc coe coi con coo cot cta ctb ctc cte cti ctn cto ctt eaa eab eac eae eai ean eao eat eba ebb ebc ebe ebi ebn ebo ebt ec- eca ecb ecc ece eci ecn eco ect eea eeb eec eee een eeo eet eia eib eic eie eii ein eio eit en- ena enb enc ene eni enn eno ent eo- eoa eob eoc eoe eoi eon eoo eot eta etb etc ete eti etn eto ett ia- iaa iab iac iae iai ian iao iat iba ibb ibc ibe ibi ibn ibo ibt ica icb icc ice ici icn ico ict ie- iea iec iee iei ien iet iia iib iic iie iii iin iio iit in- ina inb inc ine ini inn ino int io- ioa iob ioc ioe ioi ion ioo iot ita itb itc ite iti itn ito itt n-i naa nab nac nae nai nan nao nat nba nbb nbc nbe nbi nbn nbo nbt nca ncb ncc nce nci ncn nco nct ne- nea neb nec nee nei nen neo net nia nib nic nie nii nin nio nit nna nnb nnc nne nni nnn nno nnt no- noa nob noc noe noi non noo not nta ntb ntc nte nti ntn nto ntt o-i oaa oab oac oae oai oan oao oat ob- oba obb obc obe obi obn obo obt oc- oca ocb occ oci ocn oco oct oea oeb oec oee oei oen oeo oet oia oib oic oie oii oin oio oit on- ona onb onc one oni onn ono ont oo- ooa oob ooc ooi oon ooo oot ot- ota otb otc ote oti otn oto ott taa tab tac tae tai tan tao tat tba tbb tbc tbe tbi tbn tbo tbt tca tcb tcc tce tci tcn tco tct te- tea teb tec tee tei ten teo tet tia tib tic tie tii tin tio tit tna tnb tnc tne tni tnn tno tnt to- toa tob toc toe toi ton too tot tta ttb ttc tte tti ttn tto ttt