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DPU: 
0.1
Purpose: 

To filter based on the existence of a target in an input object. For example, does it include any geographical information about the author?

Type: 

The exists operator takes no argument.

Case Sensitivity: 
None
Syntax: 

exists

Synonyms: 
None
Examples: 

1. Filter for posts that include geographical information.

2. Filter for Tweets that include the author's screen name.