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There is word that keys unlock doors.

The Flintstones is an American animated series made by Hanna-Banera Productions. It first aired in the 1960s and finished in the 1980s. It centers on the titular Flintstones living in Bedrock, as they go through wacky and eccentric adventures. It is loosely inspired by The Honeymooners and references other shows.

History
In the beginning, making it was not easy due to building another success like Tom and Jerry.