import std.stdio;
 
void main() {
 
	auto c = [[[1, 2, 3], [4, 5, 6, 7, 8]],
			  [[9, 10], [11, 12, 13]]];
 
	auto d = [[c[0][0].dup, c[0][1].dup],
			  [c[1][0].dup, c[1][1].dup]];
 
	d[0][1][1 .. $ - 1] *= 3;
 
	writeln("c = ", c);
	// [[[1, 2, 3], [4, 5, 6, 7, 8]],
	//  [[9, 10], [11, 12, 13]]] // OK
	writeln("d = ", d);
	// [[[1, 2, 3], [4, 15, 18, 21, 8]],
	//  [[9, 10], [11, 12, 13]]] // OK
}
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		c = [[[1, 2, 3], [4, 5, 6, 7, 8]], [[9, 10], [11, 12, 13]]]
d = [[[1, 2, 3], [4, 15, 18, 21, 8]], [[9, 10], [11, 12, 13]]]