4

<a href="content://com.android.contacts/contacts/c6771990182636674232">Open Google Contacts</a>


<a href="intent:content://com.google.android.contacts/person/c6771990182636674232#Intent;action=android.intent.action.VIEW;end">
  Open Contact 123
</a>


<a href="android-app://com.google.android.contacts">Pick a Contact</a>



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