Question: Use Ocaml Language. Write a function contains_var : expression -> bool that returns true if and only if an expression contains a variable. Your implementation

Use Ocaml Language.

Write a function contains_var : expression -> bool that returns true if and only if an expression contains a variable. Your implementation should be recursive.

The base code:

let rec contains_var (e:expression) : bool = raise ImplementMe ;;

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