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Union

Relation R

Relation S

X	Y
1	aaa
1	bbb
2	aaa
3	ccc

X	Y
2	aaa
2	eee
3	ccc
4	fff

R ∪ S

X	Y
1	aaa
1	bbb
2	aaa
2	eee
3	ccc
4	fff

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