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CAPTCHA
This question is for testing whether you are a human visitor and to prevent automated spam submissions.
15 + 5 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.
To prevent automated spam submissions leave this field empty.

The Presence Map (PMap) is used to define this.

If the appropriate PMap bit for this field is set to 1, then the value is in the encoded FAST message. Otherwise, the value is not present in the encoded message.