Password generator

• Generate a random password with n characters
• A password consists of approximately the same number of digits as letters:
  • 8 characters = 4 letters + 4 digits
  • 9 characters = 4 letters + 5 digits
• Each letter may occur only once, each digit may occur only twice
• To avoid confusion, do not use the letters o, O, l and the digits 0 and 1
• Show a table with 10 different passwords
• Calculate for each password also a Bcrypt hash
• When the page is loaded, it generates 10 different passwords with 10 characters (the default). Use a GET or POST request (to the same page) when the form is submitted.