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@@ -81,7 +81,7 @@ export default class SpecialCharacters extends Plugin {
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* Returns a collection of symbol names (titles).
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*
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* @param {String} groupName
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- * @returns {Set<String>|undefined}
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+ * @returns {Set.<String>|undefined}
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*/
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getCharactersForGroup( groupName ) {
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return this._groups.get( groupName );
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