a-a a-b a-c a-t aaa aab aac aad aae aat aau ab- aba abb abc abd abe abt abu ac- aca acb acc acd ace act acu ad- ada adb adc add ade adt adu aea aeb aec aed aee aet aeu at- ata atb atc atd ate att atu au- aua aub auc aud aue aut b-u baa bab bac bad bae bat bau bba bbb bbc bbd bbe bbt bbu bca bcb bcc bcd bce bct bcu bda bdb bdc bdd bde bdt bdu be- bea beb bec bed bee bet beu bta btb btc btd bte btt btu bua bub buc bud bue but buu c-- caa cab cac cad cae cat cau cba cbb cbc cbd cbe cbt cbu cca ccb ccc ccd cce cct ccu cda cdb cdc cdd cde cdt cdu ce- cea ceb cec ced cee cet ceu cta ctb ctc ctd cte ctt ctu cua cub cuc cud cue cut cuu daa dab dac dad dae dat dau dba dbb dbc dbd dbe dbt dbu dca dcb dcc dcd dce dct dcu dda ddb ddc ddd dde ddt ddu de- dea deb dec ded dee det deu dta dtb dtc dtd dte dtt dtu dua dub duc dud due dut eaa eab eac ead eae eat eau eba ebb ebc ebd ebe ebt ebu ec- eca ecb ecc ecd ece ect ecu ed- eda edb edc edd ede edt edu eea eeb eec eed eee eet eta etb etc etd ete ett etu eu- eua eub euc eud eue eut taa tab tac tad tae tat tau tba tbb tbc tbd tbe tbt tbu tca tcb tcc tcd tce tct tcu tda tdb tdc tdd tde tdt tdu te- tea teb tec ted tee tet teu tta ttb ttc ttd tte ttt ttu tua tub tuc tud tue tut tuu ua- uaa uab uac uad uae uat uau uba ubb ubc ube ubt ubu uca ucb ucc ucd uce uct ucu uda udb udc udd ude udt udu uea ueb uec ued uee uet uta utb utc utd ute utt utu uua uuc uue uut uuu