Even this task has already been promoted, I noticed that the task's preamble has Possible output: shown as:
1 2 9 5 3 4
Even though it was mentioned earlier that: Each department can have a number between 1 and 7 (inclusive).
The 1st preamble example (1 2 9) is wrong because the police department can't be odd, and 9 is out of range.
The 2nd preamble example (5 3 4) is also wrong because the police department can't be odd.