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The river has long served as an important channel of water transport , although it was only after the opening of Rama VI Bridge in 1927 that a permanent land transport structure existed over the river .
 None
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