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import std.stdio;
void main() {
double[] x;
writeln(x.length);
writeln(x.capacity);
x.reserve(50);
writeln(x.length);
writeln(x.capacity);
x ~= 1.5;
writeln(x);
double[] y;
y.length = 50;
writeln(y.length);
writeln(y.capacity);
y ~= 1.5;
writeln(y);
}