- Lab 3:
  - Create a new primitive called `primlab3`.
  - The primitive should take in `1+` arguments.
    - Each argument will be the name of a result.
  - For each argument, get the result which matches that name.
    - If there is no matching result print out a warning that such a result does not exist.
    - If the result is a number, delete the result.
      - Tip: Use the `StringUtil.isNumber(...)` method.
    - If the result is not a number, print out a warning that the result can not be deleted.
  - In the case that the result is a number, print out an INFO statement explaining that it has been deleted (include the name of the result and its previous value in the message).
    - But only show this if the user supplies the `/VERBOSE` switch or if the command is run outside of a macro.
      - Tip: All commands have a `verbose` variable that is automatically set to `true` if `/VERBOSE` is set or if the command is run outside of a macro.
  - Build and test your primitive.
    - Try it with `/VERBOSE=FALSE` and `/VERBOSE=TRUE`.
    - Also try running it from a macro with and without the `/VERBOSE` switch.