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Corner pads; see figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf 20-Lead Plastic Quad Flat, No Lead Package - 9x9 mm Body [TQFP] (see Microchip Packaging Specification 00000049BS.pdf 8-Lead Plastic Dual Flat, No Lead Package (MD) - 4x4x0.9 mm Body [QFN]; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32l152ze.pdf WLCSP-143, 11x13 raster, 4.539x5.849mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UCBGA-49, 7x7 raster, 2.965x2.965mm package, pitch 0.8mm TFBGA-121, 11x11 raster, 10x10mm package.

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