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1. DartPad Dart List initialization DartPad Dart List initialization

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   // on dartpad:  https://dartpad.dev/cfded55df52dd2bb37228d12c7ef049c

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   void main() {

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     Co co = Co();

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     print(co.getTag1());     //Out: profitable

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     print(co.getMgr1().fn);  //Out: null