Question: Using pattern matching and recursion, implement the following function manipulating ilist values. Write an F# function sum: ilist -> int which takes as input a

Using pattern matching and recursion, implement the following function manipulating ilist values.

Write an F# function sum: ilist -> int which takes as input a list l of strings and returns the sum of all the elements in l. For example, sum (L(1, L(3, L(3, E)))) is 7, while sum E is 0.

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