169602
The river , the Duivenhoks ( Dovecote ) , was named by an explorer , Isaq Schrijver , who observed a lot of doves where the river flows into the Indian Ocean , at a place called Puntjie .
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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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