The ballad of Lucy Whipple Crossword

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Across
  1. 2. a person who makes and repairs things in iron by hand.
  2. 3. a large open area of grassland, especially in the Mississippi River valley.
  3. 5. the branch of mathematics dealing with the properties and manipulation of numbers.
  4. 6. a state of despair, typically one which results in rash or extreme behavior.
Down
  1. 1. the extremely large size, scale, or extent of something.
  2. 4. bad-tempered; irritable.