Divide this text into sentences and correct mistakes: 1. So imagine you've got a wave source. This could be a little oscillator that's creating a wave on a string or a little paddle that goes up and down and creates waves on water, or a speaker that creates sound waves. It could be any wave source that creates this nice simple harmonic wave. 2. Now let's say you've got a second wave source. If we take this second wave source and put it basically right on top of the first one, we're gonna get wave interference. Wave interference happens when two waves overlap. If we want to know what the total wave is going to look like, we add up the contributions from each wave. 3. If I put a little backdrop here and add the contributions, the total wave can be found by adding up the contributions from each wave. Wave one here has a value of one unit, wave two has a value of one unit. One unit plus one unit is two units, and then zero units and zero units is still zero. Negative one and negative one is negative two. And you keep doing this and you realize you're just gonna get a really big cosine-looking wave and it's gonna drop down to here. We say that these waves are constructively interfering. We call this constructive interference because the two waves combined to construct a wave that was twice as big as the original waves. When two waves combine and form a wave bigger than they were before, we call it constructive interference. And because these two waves combined perfectly, sometimes you'll hear this as perfectly constructive or totally constructive interference. You can imagine cases where they don't line up exactly correct, but you still might get a bigger...