Question: For arbitrary strings x and y, we define # y (x) to be | {(u,v) : x = uyv } |. Let = {2,4}. Let

For arbitrary strings x and y, we define #y(x) to be | {(u,v) : x = uyv } |.

Let = {2,4}.

Let L1 = {x * : #24(x) = 2. #42(x)}.

Nick created a CFG that generates L1, but before he showed it to anyone, an error occurred

Three productions were deleted, leaving blanks where they were. Here is what's left of Nick's CFG.

  • S -> blank1, blank2, blank3
  • A -> 2A,
  • B -> 4B,

Complete Nick's CFG by giving values for the blanks.

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