Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.
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Question: Primates have ____ digits on their forelimbs.

Answer: five


Question: Women have about ____ times as many foot problems as men.

Answer: four


Question: Titanium can exist in ____ crystal forms.

Answer:
two