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a b a b
A B A B
b A A B
C c A B
D E A B
a a A B
A B b A
b A b A
C c b A
D E b A
a a b A
A B C c
b A C c
C c C c
D E C c
a a C c
A B D E
b A D E
C c D E
D E D E
a a D E
A B a a
b A a a
C c a a
D E a a
a a a a
table type possible_keys key key_len ref rows Extra
t1 ALL a NULL NULL NULL 5
t2 ALL b NULL NULL NULL 5 where used
a b a b
A B b A
a a b A
A B a a
a a a a
b A A B
C c C c
a b
A B
a a
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