You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What season was the mother promoted to a main character on how i met your mother and how many episodes did that season have?" whose answer is Season 9 consists of 24 episodes.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the mother become a main character in how i met your mother and how many episodes were in that season
Useful Output:

Doc 1: The Mother's identity is officially revealed in the Season 8 finale, when we watch a woman (Cristin Milioti) carrying the yellow umbrella we've known since
Doc 2: After 208 episodes and nine seasons, "How I Met Your Mother" has met its end. The CBS sitcom finally revealed its central mystery -- how Ted
Doc 3: "How I Met Your Mother" ran for 9 years, but plenty of its recurring jokes started on season 1. The mother's name, the cocreators, and cast
Doc 4: A spin-off series that cleverly integrates elements of the original show, “How I Met Your Mother,” into a unique, enjoyable new comedy.
Doc 5: We ranked the 50 greatest episodes of How I Met Your Mother, including the origin of the slap bet, the long-awaited introduction of the titular mother, and all