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Signs & symbols
Smooth
Social Flat Rounded Rects
Stumble upon, Stumbleupon
OrangeRed
512x512
Social Shade Rounded Rects
Stumbleupon
Brown
Social Flat Dual Vertical
Social Flat Buttons
search, web-pages, Blogging
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Yellow road sign
097729, 102852, Stumbleupon
Black
Stumbleupon, square, 102851