<?xml version='1.0' encoding='UTF-8'?>
<rougail version="0.9">
  <variables>
    <variable name="leader" multi="True">
      <value>a</value>
      <value>b</value>
      <value>c</value>
    </variable>
    <variable name="follower1" type="number"/>
  </variables>
  <constraints>
    <fill name="calc_val">
      <param type="index"/>
      <target>follower1</target>
    </fill>
    <group leader="leader">
      <follower>follower1</follower>
    </group>
  </constraints>
</rougail>