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The O-C- - 2003 The Secret 1-12 is rated/received certificates of:
Australia:PG
USA:TV-14
The O-C- - 2003 The Secret 1-12 was released on:
USA: 26 November 2003
Japan: 7 October 2006
Mexico: 23 January 2007
the secret o cheese is milk
Pretty sure it was just made up for that episode
Episode 192: Nel's Secret