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But except for that one way of making it, all waves absolutely all wave-systems start out with a crest and a trough behind it. Everywhere, all the time, unless you do what I said in a bathtub." "I'm a shower man, myself," observed Soames. "But go on." "This," said the geophysics man bitterly, "is like a bathtub wave. See? The ground was jerked away, and then pushed back.
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