1 Discover 're' in cat.email:

     2     DOC (2): Re:Documents to Jane

     3     DOC (3): Re:Meeting docs

     4 

     5 Discover 'meeting' in cat.email:

     6     DOC (3): Re:Meeting docs

     7 

     8 Discover 'document' in cat.email:

     9     DOC (2): Re:Documents to Jane

    10     DOC (1): Documents to Jane

    11 

    12 Discover 'd' in cat.email:

    13     DOC (2): Re:Documents to Jane

    14     DOC (3): Re:Meeting docs

    15     DOC (1): Documents to Jane

    16