A={1,2,3,4} , B={a,e,i,o,u} A U B
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A U B=
{1,2,3,4,5,a,e,i,o,u}
.......... ... . ........ ..
A U B means A+B
...........
hope it helpd（⌒▽⌒）o(〃＾▽＾〃)o
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