Telescopic Sums
From the top: (I-G_s) + (G_s - G_2s) + (G_2s - G_3s) + ... From the bottom: ... + (G_(n-2)s - G_(n-1)s) + (G_(n-1)s - G_ns) + G_ns
Nothing special here, other than to be careful about image dimensions.
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