a-a a-b a-c a-t aaa aab aac aad aae aat ab- aba abb abc abd abe abt ac- aca acb acc acd ace act ad- ada adb adc add ade adt aea aeb aec aed aee aet at- ata atb atc atd ate att baa bab bac bad bae bat bba bbb bbc bbd bbe bbt bca bcb bcc bcd bce bct bda bdb bdc bdd bde bdt be- bea beb bec bed bee bet bta btb btc btd bte btt c-- caa cab cac cad cae cat cba cbb cbc cbd cbe cbt cca ccb ccc ccd cce cct cda cdb cdc cdd cde cdt ce- cea ceb cec ced cee cet cta ctb ctc ctd cte ctt daa dab dac dad dae dat dba dbb dbc dbd dbe dbt dca dcb dcc dcd dce dct dda ddb ddc ddd dde ddt de- dea deb dec ded dee det dta dtb dtc dtd dte dtt eaa eab eac ead eae eat eba ebb ebc ebd ebe ebt ec- eca ecb ecc ecd ece ect ed- eda edb edc edd ede edt eea eeb eec eed eee eet eta etb etc etd ete ett taa tab tac tad tae tat tba tbb tbc tbd tbe tbt tca tcb tcc tcd tce tct tda tdb tdc tdd tde tdt te- tea teb tec ted tee tet tta ttb ttc ttd tte ttt