It's quite easy to figure out displacement if all you do is change the
stroke. Your current displacement is 100%. Multiply that times the
percentage of additional stroke, and add that to your original displacement.
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"While they endure we must note their locations, elevate our gaze above the
level of our immediate concerns, imbibe the sweet air and perfect promise: the
egg miraculous upon the ledge, the bird compact upon the egg, its generous
warmth, its enviable patience, its natural fortitude and grace." E.B. White
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