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What's the square reef knot used for?

  1. Tying 2 ropes of unequal diameter together

  2. Tying 2 ropes of equal diameter together

  3. Securing a boat to a dock

  4. Raising a flag

The correct answer is: Tying 2 ropes of equal diameter together

The square reef knot is specifically designed for tying together two ropes of equal diameter. This knot is not suitable for tying ropes of unequal diameter together as it may slip or come undone. Additionally, the square reef knot is not commonly used to secure boats to docks or to raise flags, as there are other more secure knots that serve those purposes. Therefore, the most accurate and useful answer is B, tying two ropes of equal diameter together.