HW13 installment 1...
  33A  Rosen7.7  4
  33B  Rosen7.7  6
  33C  Rosen7.7 12
  33D  Rosen7.7 18
  33E  Rosen7.8  4
  33F  Rosen7.8 16

HW13 installment 2...
  34A  Rosen8.1  2
  34B  Rosen8.1 10
  34C  Rosen8.2 12b
  34D  Rosen8.2 14d

HW13 installment 3...
  35A  Rosen8.3  6b
  35B  Rosen8.3  8(preorder, inorder, postorder)
  35C  Rosen8.3 26ac