Fixed Input Parser to Work with Indented JSON
Updated Input for Part-3
Implemented 4 New Methods For Parser

* isFunction
* intersection
* Union
* subtraction
* range and domain
Added Function Difference and Fixed Others

Set subtraction was incorrect, works now.
Added Inverse Function Operator

Updated the input file for testing.

Added a pair inverter and the other parsing functions.
Added an Is-Injective Function and Parser Ops
Added Deep Copy methods

This was for my sanity and to make things actually work.
Fixed Subtraction and Added Deep Copy

The error was in the input file. Doi.