var lookup = {},
	result = [];

JSON.parse(value).forEach(function (event) {
	var filter = event.EventCategories + event.SourceIdentifier + event.SourceType;
	if (!(lookup[filter])) {
		lookup[filter] = 1;
		result.push({
			'{#EVENT_CATEGORY}': event.EventCategories,
			'{#EVENT_SOURCE_ID}': event.SourceIdentifier,
			'{#EVENT_SOURCE_TYPE}': event.SourceType
		});
	}
});

return JSON.stringify(result);