"<a href=""https://www.youtube.com/watch?v=amCsM265Lw0&amp;t=2m00s"">2:00</a> Funny but wrong. Doing those two operations one after the other doesn't get you back to where you started (the Identity). The inverse function probably involves vomiting alas.",(reply>), The first one brings marine phosphorus and concentrates it on land. The second one does the opposite. But yes, it's not an inverse. The cat would have to eat a lot bigger fish.