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<mvt:assign name="g.string" value="'Hello World!'" />
<mvt:while expr="g.counter LT len(g.string)">
	<mvt:assign name="g.counter" value="g.counter + 1" />
	<mvt:eval expr="substring_var( g.string, g.counter, 1 )" /><br>
</mvt:while>