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Unless they simply took random letters from some other text to get their spaces, in which case you'd get the correct frequency, in a sufficiently large text, with no meaning.

My initial thought was that they were inserted as a diversion to those who thought a simple frequency analysis would break what appeared to be a simple substitution cipher. Whereas in practice, the 'expected' substitutions yield gibberish, and the actual message is encoded using poly-alphabetic substitutions to throw off simple attacks.

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