Electrum 2 validation: how is the HMAC always 01…?

Electrum version 2 creates a seed from a random number which is then encoded as a mnemonic. The seed is validated by checking that the hmac begins with the bytes 01 or 101 for standard and 2fa types, respectively. I have looked at the python code on github and indeed it does return the 01 byte (…)
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