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            <td style="vertical-align: top;"><span
 style="font-family: Courier New,Courier,monospace;">bool <span
 style="font-weight: bold;">belongs</span>(</span><br
 style="font-family: Courier New,Courier,monospace;">
            <span style="font-family: Courier New,Courier,monospace;">&nbsp;
&nbsp; SourceCategory source_category,</span><br
 style="font-family: Courier New,Courie