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create table a (m int, n int); insert into a values (1, 2), (2, 3), (3, 4); create table b (m int, n int); insert into b values (1, 2), (1, 3), (3, 4); create table c (m int, n int); insert into c values (1, 3), (1, 3), (3, 4); table a; table b; table c; table a union all table b union all table c;

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