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In page The Producers (1967 film):

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Brooks first envisioned his story as a novel, and changed it to a play when publishers told him it had "too much dialogue. Not enough narrative".[citation needed][8] He wrote the script in nine months, with the help of secretary Alfa-Betty Olsen.[2] During the process, he mentioned in an October 1966 interview with Playboy that he was working on Springtime for Hitler, "a play within a play, or a play within a film – I haven't decided yet".[9] Then, it evolved into a screenplay to take advantage of various settings, as "it could go places, it wouldn't have to stay in the office".[1]