Crossword clues

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Across
  1. 3. This is made out of pig and it is in little strips.
  2. 5. The opposite of curved is --------.
Down
  1. 1. You do this on festvals.
  2. 2. +, -, ×, ÷ and = are all ---- symbols.
  3. 4. Lincoln Peirce made the book called “big ----“.