1. 
   Yst
   YST is an abbreviation for Yukon Standard Time
   Found op http://www.probertencyclopaedia.com/N25.HTM
   
   
2. 
   YST
   `` is a three-letter abbreviation with multiple meanings, as described below: ...
   Found op http://en.wikipedia.org/wiki/YST
   
   
3. 
   yst
   1) Abbreviation for yukon standard time
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/yst/1
   
   

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