<?xml version="1.0"?>
<sparql
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:xs="http://www.w3.org/2001/XMLSchema#"
    xmlns="http://www.w3.org/2005/sparql-results#" >
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    <variable name="v1"/>
    <variable name="y"/>
    <variable name="v2"/>
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      <binding name="v1">
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      <binding name="v2">
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</sparql>
