6637
Simple explanation The surface tide propagates as a wave , in which water parcels in the whole water column oscillate in the same direction at a given phase ( i.e. , in the trough or at the crest , Fig. 1 , top ) .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None