3-1-2-“F” is the write in one stroke?

Animals believe the answer to this quiz at shore.

“This quiz is not true,” Dodo says.
“I found the answer.” Rats says.

Quiz：Unicursal figure Quiz

Please write a “F” in one stroke.

Hint

The answer is exists.
Let’s capture the “F” as a figure.

Answer

You can write in outline of “F”.

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