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- import std.stdio;
- void main()
- {
- string[int] numbers = [ 0 : "zero", 1 : "one", 2 : "two", 3 : "three" ];
- int number = 2;
- auto element = number in numbers;
- if (element) {
- writefln("I know: %s.", *element);
- } else {
- writefln("I don't know the spelling of %s.", number);
- }
- }
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