Say that CL contains classes, but that it is not class-centered (or whatever the term is). Give code from Norvig to read. Talk about sentinels, accumulate with push then reverse, Insert those slides between 55 and 56. In PLP, they have seen lots of containers (including AVL trees), it could be useful to do some of them, just for comparison. In PLP, they have seen exceptions, but they have treated them as errors. Talk about the possibility to use exceptions normally (for instance to multiply the leaves of a tree) and to transmit information in exceptions (by subclassing). Also talk alot about unwind-protect.