Exercise 3 solution

Typical result: the double fisherman's grips very tightly and the two knots sit close together. After a hard pull it can be difficult to untie; working the wraps loose with a fingernail or a spike helps.
Useful for: joining two cords of similar thickness into a loop or a longer line where a secure join is needed, for example making a loop of cord. For real climbing use, get proper instruction first.