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To determine the "friend" -− "foe" status, do as follows:

1. Select a photo (1).
   
2. Click the Image Removed button Image Added button. 

The Search bar (2) will display the probability that the person is a "stranger".
The algorithm  is as follows: 

1. The person is compared to all the recognized persons in the last 30 days.
2. The number of days (N) in which the person was captured by camera and recognized is calculated.
3. The probability is calculated according to the formula (1-1−N/30) * 100.