-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aat ab- aba abb abc abe abi abt ac- aca acb acc ace aci act aea aeb aec aee aei aet ai- aia aib aic aie aii ait at- ata atb atc ate ati att baa bab bac bae bai bat bba bbb bbc bbe bbi bbt bca bcb bcc bce bci bct be- bea beb bec bee bei bet bi- bia bib bic bie bii bit bta btb btc bte bti btt c-- caa cab cac cae cai cat cba cbb cbc cbe cbi cbt cca ccb ccc cce cci cct ce- cea ceb cec cee cei cet ci- cia cib cic cie cii cit cta ctb ctc cte cti ctt eaa eab eac eae eai eat eba ebb ebc ebe ebi ebt ec- eca ecb ecc ece eci ect eea eeb eec eee eet eia eib eic eie eii eit eta etb etc ete eti ett ia- iaa iab iac iae iai iat iba ibb ibc ibe ibi ibt ica icb icc ice ici ict ie- iea iec iee iei iet iia iib iic iie iii iit ita itb itc ite iti itt taa tab tac tae tai tat tba tbb tbc tbe tbi tbt tca tcb tcc tce tci tct te- tea teb tec tee tei tet tia tib tic tie tii tit tta ttb ttc tte tti ttt