Anyone who does not understand this is a ♥♥♥♥♥♥♥ idiot and needs to go back to middle school or high school where you should have learned this ♥♥♥♥, if you school never taught you this then everyone in charge of the decision making when it comes to curriculum should be replaced with someone who isn't ♥♥♥♥♥♥♥ stupid.