WolframAlpha input to get truth tables (logic)

[PRAXADO]

I'm trying to get WolframAlpha to construct a truth table for the statement: ~q → ~p. My input, "truth table not q then not p" doesn't yield the desired result. Would you suggest an alternative wording or notation that would be more readily processed by Wolfram?

https://www.wolframalpha.com/input/?i=+truth+table+not+q+then+not+p+​

 

[pka]

I'm trying to get WolframAlpha to construct a truth table for the statement: ~q → ~p.

HERE IT IS

 

[Dr.Peterson]

Or, of course, you can take the hint in the way they restate it, and enter it this way.