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<canvas width="400" height="400" canvas_background="220">
<_ x="0"
repeat="UNTIL, x GREATER_THAN width"
change="x: x + s"
s="width / 10"
>
<_ y="0"
w="width / 10"
repeat="UNTIL, y GREATER_THAN height"
change="y: y + s">
<square fill_color="mouse_over ? 'yellow': 'white'">
</square>
</_>
</_>
</canvas>