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Two more purpose built container ships , MV Kanimbla and MV Manoora joined the regular service in 1969 and the three ships continued to operate until 1975 when competition from rail freight made the service non-viable .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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