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Amazon.com : Ampad 8 1/2 x 11 Inches White Quad Pad, 4 Square Inch, 50 Sheets, 1 Each (22-030C) : Graph Paper : Office Products
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Opto 22 PB32HQ Quad 8-Module Quad Pak Mounting Rack with Header Connector for B4 Brain: Io Modules: Amazon.com: Industrial & Scientific