>>44112332A necessary condition is something that must happen for an event to occur, a sufficient condition is the event.
Dragon moves are widely used - the sufficient condition
Dragon moves hit everything neutrally - the necessary condition
Normal moves hit everything neutrally - necessary condition
But just because the necessary condition of normal STAB hitting everything is true, it doesn't mean normal STAB is used widely because X STAB hitting most things neutrally is not the sole reason something is popular.
Alternatively, if you need other examples:
"Earth is habitable for human life, because Earth orbits the sun. Jupiter orbits the sun. Therefore, Jupiter is habitable for human life."
"I did well on the test. In order to do well on the test, I had to study. Mary studied, so she had to have done well on the test."
t. law student