-ic a-a a-b a-c a-i a-t aaa aab aac aad aai aat ab- aba abb abc abd abi abt ac- aca acb acc acd aci act ad- ada adb adc add adi adt ai- aia aib aic aid aii ait at- ata atb atc atd ati att baa bab bac bad bai bat bba bbb bbc bbd bbi bbt bca bcb bcc bcd bci bct bda bdb bdc bdd bdi bdt bi- bia bib bic bid bii bit bta btb btc btd bti btt c-- caa cab cac cad cai cat cba cbb cbc cbd cbi cbt cca ccb ccc ccd cci cct cda cdb cdc cdd cdi cdt ci- cia cib cic cid cii cit cta ctb ctc ctd cti ctt daa dab dac dad dai dat dba dbb dbc dbd dbi dbt dca dcb dcc dcd dci dct dda ddb ddc ddd ddi ddt di- dia dib dic did dii dit dta dtb dtc dtd dti dtt i-d ia- iaa iab iac iad iai iat iba ibb ibc ibd ibi ibt ica icb icc icd ici ict ida idb idc idd idi idt iia iib iic iid iii iit ita itb itc itd iti itt taa tab tac tad tai tat tba tbb tbc tbd tbi tbt tca tcb tcc tcd tci tct tda tdb tdc tdd tdi tdt tia tib tic tid tii tit tta ttb ttc ttd tti ttt