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You are given a log file containing semicolon-separated entries. Each entry is a comma-separated pair of a user ID and the number of errors that user generated on a particular day. The log covers several days, and days are separated from each other by a newline. Write a function that, given this multi-day log and an integer threshold, returns the list of user IDs who exceeded the error threshold on every single day that appears in the log. The order of user IDs in the result does not matter.