"But wait! What about...[something he guided us to forgot about
  from the previous chapter but suddenly brings back again]?" - I
  love those two little words, just after explaining something.
  Good educator and a great refresher. While the math itself isn't
  my thing, the explanations are wonderful. [reading math is like
  sheet music; I *can* do it, but I really prefer to pretend that
  I can't, especially to myself]

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