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class Stack<T> {
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final List<T> _list = [];
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void push(T element) {
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_list.add(element);
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}
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T pop() {
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var element = _list.last;
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_list.removeLast();
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return element;
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}
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T peek() {
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return _list.last;
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}
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bool get isEmpty => _list.isEmpty;
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bool get isNotEmpty => _list.isNotEmpty;
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}
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