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import std.stdio;
class A
{
B b = new B();
}
class B
{
int i = 0;
}
void main()
{
A firstA = new A();
A secondA = new A();
firstA.b.i = 42;
writeln("First A's b.i: ", firstA.b.i);
writeln("Second A's b.i: ", secondA.b.i);
}