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The "Patterns2" page has been changed by rezan:
https://wiki.apache.org/devicemap/Patterns2?action=diff&rev1=25&rev2=26

  If no candidate patterns are found, the Default``Id is returned. If no
  Default``Id is defined, a null pattern is returned.
  
- 2 or more patterns cannot have identical Rank``Type, Rank``Value, and matched 
tokens. This is undefined behavior since the patterns are identical. The 
pattern the classifier chooses can be random.
+ 2 or more patterns cannot have identical Rank``Type, Rank``Value, and pattern 
tokens. This results in undefined behavior when the patterns are candidates 
since they are identical. The classifier is allowed to choose any one candidate 
in this situation, so the result can be random.
  
  New pattern types and ranks can be introduced in the future. If a classifier 
encounters a definition it cannot support, it must immediately return an 
initialization error.
  

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