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 * <<la("PH102_HW1_rev.pdf","Homework 1, Due: Jan 20")>>  * <<la("hw1rev.pdf","Homework 1, Due: Jan 20 -Revised (see the red text for changes)")>>.
   * ~-<<color(Correction)>>: Problem 4(a), $B > 0$ when $U_0 > 0$ and $B < 0$ when $U_0 < 0$.-~
   * ~-<<color(Correction)>>: Problem 4(b), "the similarity" &rarr; "the similarity or the difference".-~