This dumb password rule is from MTS Serbia.

MTS is a national mobile and internet provider in Serbia and they have bad password rules.
Translation: The password must have more than 6 character, less than 17 characters and one
of the following combinations: upper case or lower case letter and a number, upper case or
lower case letter and a ...

https://dumbpasswordrules.com/sites/mts-serbia/

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