In SML, combine the two separate code and rewrite into a single function named union that returns the union of two lists.

C++ for Engineers and Scientists
4th Edition
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Bronson, Gary J.
Chapter6: Modularity Using Functions
Section6.2: Returning A Single Value
Problem 13E
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fun member(x,[]) = false        
|   member(x,b::y) =
       if x=b then true         
       else member(x,y);         
fun union([],y) = y
|   union(a::x,y) =
       if member(a,y) then union(x,y)
       else a::union(x,y);

In SML, combine the two separate code and rewrite into a single function named union that returns the union of two lists.

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