Ideas in this flowchart

• Restricting the last four positions of seven-character plates to digits greatly reduces the number of possible plates.
• Virginia outlaws personalized plates and assigns each vehicle a randomly generated seven-character plate.
• The last four characters must be digits, so a plate such as “RFP-6YQ7” is impossible.
• Positions 1 through 3 each have 36 possible choices.
• Positions 4 through 7 each have only 10 possible choices.
• The total is calculated as 36 × 36 × 36 × 10 × 10 × 10 × 10.
• This produces 466,560,000 possible plates.
• The restricted system provides only about 0.006 times as many plates as the previous system.
• All seven positions should use alphanumeric characters instead.