title: D trigger scheme test
body: <p><a href="https://i.stack.imgur.com/5Kcdi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5Kcdi.png" alt="enter image description here"></a>I want to test my D trigger scheme and I don't know how to do that. I don't even know how "truth table" works and maybe someone can help/explain how to make a test for my D trigger scheme?</p>