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dest[x,y] = (((src[x-1,y]+src[x+1,y]+src[x,y+1]+src[x,y-1]) / 2) - dest[x,y])
dest[x,y] = (((src[x-1,y]+src[x+1,y]+src[x,y+1]+src[x,y-1]) / 4) - dest[x,y])