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(match '(- ?x ?x)
         '(- y 3))

  • A: ((?x y))
  • B: ((?x 3) (t t))
  • C: nil
  • D: ((?x y) (?x 3) (t t))
  • E: true

    Answer: C

    This does not match because the variable ?X would have to match two different things.