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Amazon.com: AC Doctor INC 20V 3.25A 65Watt Rectangle USB Tip Laptop AC Adapter For Lenovo ThinkPad Edge E431 E531 11e L440 L540 S431 Laptop Charger with Power Cord : Electronics
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20V 2.25A 45W AC Adapter/Charger (Tip: 4.0mm x 1.7mm) for Select Lenovo Laptops - iFixit Store