Puzzles

• Puzzle: ast
  Wed, Feb 4
• Puzzle: bool
  Wed, Feb 11
• Puzzle: loop
  Mon, Feb 16
• Puzzle: class
  Mon, Feb 23
• Puzzle: vars
  Fri, Feb 27
• Puzzle: stack
  Wed, Mar 4
• Puzzle: type
  Wed, Mar 11
• Puzzle: rel
  Mon, Mar 30
• Puzzle: clos
  Mon, Apr 6