...AABEqfuwAAAAAESp/AwAAAAARKn8aAAAAABEqfzEAAAAAESp/SBDNOW9RKn9e0NlYU9Eqf3XQ0R360Sp/jNCwDr2RKn+jwAAAABEqf7rAAAAAESp/0YAAAAARKn/ogAAAABErEarAAAAAESsRwoAAAAARKxHaAAAAABErEfGAAAAAESsSCVCE4y4RKxIg0NICpdErEjhQ4IvIkSsSUBDKx7dRKxJngAAAABErEn8AAAAAESsSloAAAAARKxKuQAAAABEtQkRAAAAAES1CXkAAAAARLUJ4QAAAABEtQpKAAAA...

...ng average), your system might set the global limit to 3 times that -- ie. 360 failed attempts over a 24 hour period. Then, if the total number of failed attempts across all accounts exceeds that number within one day (or even better, monitor the rate of acceleration and trigger on a calculated thre...

...to 4 towns and you have (iirc) 12 possibilities. With 5 it's 60. 6 becomes 360. This is a function of a mathematical operation called a factorial. Basically: 5! = 5 × 4 × 3 × 2 × 1 = 120 6! = 6 × 5 × 4 × 3 × 2 × 1 = 720 7! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040 … 25! = 25 × 24 × ...