Counterintuitively, when things are non-interchangeable you have to do a lot more swapping
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Because you would expect to interchange interchangeable things
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Huh? When they aren't, you have to swap things instead of using interchangeables in place, not vice versa.
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Hm interesting subtlety. When you do redundancy swaps, you are either reacting to a failure that makes a part unique, or balancing out wear

