="org-string">"f"</span>)
                                          (<span class="org-builtin">:=</span> 'surname-1 'p.surname-2)
                                          (<span class="org-builtin">:&lt;&gt;</span> 'pack-id 'p.pack-id)
                                          (<span class="org-builtin">:&lt;&gt;</span> 'pack-id 'dads.pack-id)))
                            'moms)
    <span class="org-builtin">:on</span> 't))
</pre>
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