Manager: Since most of these are not used, let’s go through and upgrade those first, then we’ll see what’s left.
Programmer: If they’re not used, we don’t need to upgrade them, right?
Manager: Right, but we need to figure out which ones are used.
Programmer: Can’t we figure that out by eliminating the ones that aren’t used without upgrading them?
Manager: No, we need to upgrade the obsolete programs first.
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