a-a a-b a-c a-t aaa aab aac aad aat aau ab- aba abb abc abd abt abu ac- aca acb acc acd act acu ad- ada adb adc add adt adu at- ata atb atc atd att atu au- aua aub auc aud aut b-u baa bab bac bad bat bau bba bbb bbc bbd bbt bbu bca bcb bcc bcd bct bcu bda bdb bdc bdd bdt bdu bta btb btc btd btt btu bua bub buc bud but buu c-- caa cab cac cad cat cau cba cbb cbc cbd cbt cbu cca ccb ccc ccd cct ccu cda cdb cdc cdd cdt cdu cta ctb ctc ctd ctt ctu cua cub cuc cud cut cuu daa dab dac dad dat dau dba dbb dbc dbd dbt dbu dca dcb dcc dcd dct dcu dda ddb ddc ddd ddt ddu dta dtb dtc dtd dtt dtu dua dub duc dud dut taa tab tac tad tat tau tba tbb tbc tbd tbt tbu tca tcb tcc tcd tct tcu tda tdb tdc tdd tdt tdu tta ttb ttc ttd ttt ttu tua tub tuc tud tut tuu ua- uaa uab uac uad uat uau uba ubb ubc ubt ubu uca ucb ucc ucd uct ucu uda udb udc udd udt udu uta utb utc utd utt utu uua uuc uut uuu