In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
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Question: Some manatees have _ or four nails on the tip of each flipper.

Answer: three


Question: Diffusion occurs between the capillaries of the _ blood supplies.

Answer: two


Question: High stress has the highest pitch, about _ notes above a vowel without a stress mark.

Answer:
four