Reduce "a ballpark figure"

<rule id="ID" name="Reduce "a ballpark figure".">    
 <pattern>
  <token>a</token>
  <token>ballpark</token>
  <token>figure</token>
 </pattern>
 <message>Reduce "a ballpark figure" to <suggestion>an estimate</suggestion>.</message>
 <url>https://books.google.com/books?id=bGq76PDy3sgC&pg=PT34&lpg=PT34&dq#v=onepage&q&f=false</url>
 <example correction=''>That is just <marker>a ballpark figure</marker>.</example>
 <example>That is just an estimate.</example>
</rule>