<snapdata remixID="8925594"><project name="U2L4-checkerboard_SV" app="Snap! 5.1, http://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><stage name="Stage" width="480" height="360" costume="0" color="255,255,255,1" tempo="60" threadsafe="false" volume="100" pan="0" lines="flat" ternary="true" codify="false" inheritance="false" sublistIDs="false" scheduled="false" id="1"><pentrails>data:image/png;base64,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</pentrails><costumes><list 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