Findings:
- Mike Callahan
- Chronical
- Callahan's Key
- Callahan's Legacy
- Callahan's Secret
- callahan (user)
- Callahan's Lady
- The Callahan Touch
- Lady Sally Callahan
- John Callahan
- Callahan Rules for Ultimate
- Bill Callahan
- #callahans
- Callahan's Place
- Callahan's Crosstime Saloon
- Harry Callahan
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