Howl's Moving Castle: How Closely Does Studio Ghibli's Film Follow The Book?

In 2004, Studio Ghibli released "Howl's Moving Castle," an anime film based on Diana Wynn-Jones' 1986 novel. How closely does the movie follow the book?
In 2004, Studio Ghibli released "Howl's Moving Castle," an anime film based on Diana Wynn-Jones' 1986 novel. How closely does the movie follow the book?

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