Meet Bob. Bob works in a warehouse gathering items to ship out for fulfillment of online orders. Customers hate to pay for extra shipping, so companies like Bob’s often group items going to the same destination together into the same box to save on shipping costs. The criteria for grouping sound simple: an item can only be placed in a box with another item if both items are going to the same destination. Whether Bob realizes it or not, he is performing an equivalence relation to the shipping orders he fills.
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