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size(0,100);
import patterns;
real d=4mm;
picture tiling;
path square=scale(d)*unitsquare;
axialshade(tiling,square,white,(0,0),black,(d,d));
fill(tiling,shift(d,d)*square,blue);
add("shadedtiling",tiling);
filldraw(unitcircle,pattern("shadedtiling"));
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