For oz programming language: list for each of the following procedure definitions the external references.1. proc {p x y} {q x y} end2. proc {p x y} {p x y} end3. proc {p x y} {x y} end4. proc {p x y} {q z u x} end5. proc {p x y} local z in {q z u} end end

File i/o activity objective: the objective of this activity is to practice working with text files in c#. for this activity, you may do all code in the main class. instructions: create an app that will read integers from an input file name numbers.txt that will consist of one integer per record. example: 4 8 25 101 determine which numbers are even and which are odd. write the even numbers to a file named even.txt and the odd numbers to a file named odd.txt.