Exercise 2.52 - carrying out the last paragraph of Section 2.2
Section 2.3.1: (quote). What fresh new hell is this!?
Exercise 2.53: more plug and chug, but valuable practice nonetheless
Exercise 2.54: implementing the built-in function (equal?)
more notes while tinkering with Exercise 2.54
Exercise 2.55 - one more funny case, nesting (quote) in true Scheming style