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function d3_selection_enter(selection) {
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d3_arraySubclass(selection, d3_selection_enterPrototype);
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var d3_selection_enterPrototype = [];
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d3.selection.enter = d3_selection_enter;
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d3.selection.enter.prototype = d3_selection_enterPrototype;
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d3_selection_enterPrototype.append = d3_selectionPrototype.append;
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d3_selection_enterPrototype.insert = d3_selectionPrototype.insert;
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d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;
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d3_selection_enterPrototype.node = d3_selectionPrototype.node;