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var d=Dictionary("A","alpha","D","delta", "B","beta", "C", "gamma");
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d.keys.pump(Console.print,fcn(k){String(k,",")})
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d.values.apply("toUpper").println();
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d.makeReadOnly(); // can only iterate over k,v pairs if read only
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foreach k,v in (d){print(k,":",v,"; ")}
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