Definition: The answer will be 'yes' if the provided sentence contains an explicit mention that answers the given question. Otherwise, the answer should be 'no'. Instances where the answer is implied from the sentence using "instinct" or "common sense" (as opposed to being written explicitly in the sentence) should be labeled as 'no'.
Input: Sentence: Sarawak's coast and jungle interior were controlled by the Iban — Sea Dayak pirates and Land Dayak slash-and-burn farmers. 
Question: How often had the Iban had control of the Sarawak's coast?

No.