By the way, to clarify explicitly a couple of things about the “extra credit homework” (Trees are easy to draw) that I handed out in the last class.

It says on it that is due on some imaginary Friday, but it is not. It is due on the 18th, a Tuesday, at the final.

The idea is that this essentially replaces your second-lowest homework score (your lowest homework score having already been dropped). So, it helps more if you’ve missed a homework or didn’t do well on a couple of them—but it’s also not bad as a kind of a review exercise as well. You can’t lose points by handing it in, either.