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         x="94.823761"
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         id="tspan2143-5-0"> Primary key</tspan><tspan
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         id="tspan13837">   creates a</tspan><tspan
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         id="tspan13839">    signature</tspan><tspan
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         id="tspan18684">      the User ID</tspan><tspan
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         x="94.823761"
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         id="tspan18686">      with itself</tspan></text>
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