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: Titanium is found in column ____ along with chemically similar zirconium, hafnium, and thorium.

Answer: four


Question: Cattails contain ____ times the starch of an equal weight fo potatoes.

Answer: ten


Question: Retraction requires the contraction of ____ internal muscles.

Answer:
two