title: Remove records based on other record values in R
body: <p>I have three columns of data: Recipient_ID, Offer_Key, and Response_Code</p>
  
  <p>Whenever an email is sent, a record is generated with Response_Code = 1</p>
  
  <p>Whenever an email bounces, the Response_Code = 2, 3, or 4, depending on the type of bounce.</p>
  
  <p>What I want to do is find the bounced email records, remove the corresponding sent email records for each one(with the same Offer_Key), then remove the bounced email records.</p>
  
  <p>Any ideas?</p>