Nintex Form Expressions Help

We have the requirement for some validation on a Nintex Form that I can not seem to figure out on my own...

Below is the form;

So what we need to do is if the Status field is either "Completed" or "Cancelled" or "Incomplete" then Either the "Waiting Start Date" and "Information Received" fields must both be empty or both be filled other wise the Save and Notify button will be disabled.

How I am going to achieve this is by applying a rule to the Save and Notify button that uses an expression that checks the above requirements... I am more than fine if this has to use 2 rules. I just need some help with writing the expression/s.

Thank you 

Dan