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GPIO Stacking Header for Pi A+/B+/Pi 2/Pi 3 [Extra-long 2x20 Pins] : ID 2223 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: GPIO Reference Board for The Raspberry Pi Model A+, B+, Zero, 2, 3, 3B+, 4 (2 Pack) : Electronics
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