Hi. As it can be seen at the ocean waves arrange in sets. Typical a set of 5 to 7 waves where the middle ones are the biggest. What I don't understand is how this can happen. Is it really possible for waves to exchange energy with each other..?? I though that linear plane waves could "interact" in forms of constructive/destructive interference but not that wave in the middle of a wave set could somehow suck energy from the others.. Maybe its because I am comparing EM waves with mechanical longitudinal waves or what..?