In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Mature cysts have _ nuclei while the immature have two.
[EX A]: four

[EX Q]: Woodchucks can dig up to _ entrances to one den.
[EX A]: three

[EX Q]: Creatine is legal because there has been _ serious short term or long term side effects known.
[EX A]:
no