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OpenStudy (anonymous):
Let X = {5, 10, 15, 20, 25, 30, 35, 40}. Define a relation |= on X as follows. For a, b is in X, a |= b if b can be obtained from a by adding a (possibly empty) collection of dimes (10 cents) and quarters (25 cents). List all minimal elements of (X, |= ). (Enter your answers as a comma-separated list.)
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