T00*






A__*
B__*


a__1



a__2



b__1



b__2

AA_*
AB_*
BA_*
BB_*


aa_1



aa_2



ab_1



ab_2



ba_1



ba_2



bb_1



bb_2

AAA*
AAB*
ABA*
ABB*
BAA*
BAB*
BBA*
BBB*




























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