Ending a sentence with a redundant "at"

1 
<rule id="ID" name="Avoid using "at" to end a sentence in redundant circumstances.">    
 <pattern case_sensitive='yes'>
  <token>at</token>
  <token>?</token>
 </pattern>
 <message>Avoid using "at" to end a sentence when it is redundant. e.g. "Where are you at?"</message>
 <url>https://books.google.com/books?id=bGq76PDy3sgC&pg=PT34&lpg=PT34&dq=%22ending+a+sentence+with+at%22+.edu&source=bl&ots=Ro5UdGDTgU&sig=IT_oYJoDl8WRSnAzZOjFlOPUyB8&hl=en&sa=X&ved=0ahUKEwiEm8vG8azJAhVC7iYKHTY_D8MQ6AEIRzAG#v=onepage&q=%22ending%20a%20sentence%20with%20at%22%20.edu&f=false</url>
 <example correction=''>Where are you <marker>at?</marker></example>
 <example>Where are you?</example>
</rule>
2

Thanks for this rule and the others, I will add them next week all at once.