visio 2013 standard does not show the "UML Sequence" template

visio 2013 standard does not show the "UML Sequence" template as shown below
only professional viso 2013 shows it?
are there existing sample diagrams which i can use as sample and modify on top of them easily?
any alternate tool to draw these type of diagrams easily apart from visio like free open source tools?
Please advise
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gudii9Author Commented:
please advise
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