spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-schedulerx/src/main/java/com/alibaba/cloud/scheduling/schedulerx/util/CronExpression.java [717:728]:
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		boolean first = true;
		while (itr.hasNext()) {
			final Integer iVal = itr.next();
			final String val = iVal.toString();
			if (!first) {
				buf.append(",");
			}
			buf.append(val);
			first = false;
		}

		return buf.toString();
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spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-schedulerx/src/main/java/com/alibaba/cloud/scheduling/schedulerx/util/CronExpression.java [743:754]:
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		boolean first = true;
		while (itr.hasNext()) {
			final Integer iVal = itr.next();
			final String val = iVal.toString();
			if (!first) {
				buf.append(",");
			}
			buf.append(val);
			first = false;
		}

		return buf.toString();
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