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import three;
currentprojection=orthographic(0,0,1);
triple[][] A={
{(0,0,0),(1,0,0),(1,0,0),(2,0,0)},
{(0,4/3,0),(2/3,4/3,2),(4/3,4/3,2),(2,4/3,0)},
{(0,2/3,0),(2/3,2/3,0),(4/3,2/3,0),(2,2/3,0)},
{(0,2,0),(2/3,2,0),(4/3,2,0),(2,2,0)}
};
triple[][] B={
{(0.5,0,-1),(0.5,1,-1),(0.5,2,-1),(0.5,3,-1)},
{(0.5,0,0),(0.5,1,0),(0.5,2,0),(0.5,3,0)},
{(0.5,0,1),(0.5,1,1),(0.5,2,1),(0.5,3,1)},
{(0.5,0,2),(0.5,1,2),(0.5,2,2),(0.5,3,2)}
};
split S=split(A,B,10);
//write(S.T.length);
for(int i=0; i < S.T.length; ++i)
draw(surface(patch(S.T[i])),Pen(i));
draw(surface(patch(B)),blue);
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