I just voted it #1. Thanks for pointing it out, Ron, as I was unaware of it and definitely could use it - been doing it all this week on a spreadsheet using the "Sets in your collection ..." feature for assistance.
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“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis