"Once upon a ....., there was a unicorn that lived in a forest. That unicorn was the only one of his kind that was not able to fly," Matt started saying after his daughter asked him to tell her a bedtime story.

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"Once upon a ....., there was a unicorn that lived in a forest. That unicorn was the only one of his kind that was not able to fly," Matt started saying after his daughter asked him to tell her a bedtime story. (*) period (*) era (*) decade (*) time

This is a companion discussion topic for the original entry at https://english.best/questions/14602,once-upon-a-___-there-was-a-unicorn-that-lived-in-a-forest-that-unicorn-was-the-only-one-of-his-kind-that-was-not-able-to-fly-matt-started-saying-after-his-daughter-asked-him-to-tell-her-a-bedtime-story/