If you build yourself, go ahead and reuse them, since there's little to lose. OTOH it's probably false economy to reuse them if you're paying $30 or more for labor.
If you do decide to reuse them, keep track of elbow in and elbow out spokes. The elbow takes a setat an angle other than original. Elbow out spokes are bent more and elbow in spokes are opened out slightly. You want to use them maintaining rather than changing the set.
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