In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
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Question: Melanocytes are dendritic and are distributed roughly _ per six basal cells.

Answer: one


Question: Acrobats mount a single bicycle until _ people in all are stacked on top of it.

Answer: ten


Question: Pangolins walk on all _ of their stout limbs, which are adapted for digging.

Answer:
four