There are 4 wrenches just unpacked from a box. They all look the same. There might be one defective item which is either heavier or lighter. Fortunately there is a fifth one that is standard. If you can use a scale to weigh only 2 times, can you find out: 1. Is there a defective wrench?
2. If there is a defective item, is it heavier or lighter?
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