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Breaking Chocolate

You are given a bar of chocolate made up of 15 small blocks arranged in a 3×5 grid.
You want to snap the chocolate bar into 15 individual pieces. What is the fewest number of snaps that you need to break the bar? (One snap consists of picking up one piece of chocolate and snapping it into two pieces.)

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If you enjoyed this puzzle, check out Sunday Afternoon Maths LXV,
puzzles about chocolate, or a random puzzle.
© Matthew Scroggs 2019