Here is the supreme guide to knocking on wood. Of course, the number of knocks depends on the type of wood.
Oak, 2 knocks.
Pine, 8 knocks.
Red cedar, 1 knock (this is the most magical wood).
Mahogany, 4.3 knocks.
Maple, 3 knocks.
Douglas fir, 6 knocks.
English
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How does one get a fraction of a knock? in the event the only wood near by is a coffin or something.