Recently I came up with a password requirement rules as follows : The pasword must

• be 8-16 characters
• contain at least one number
• contain at least one lower case letter
• contain at least one upper case letter
• contain at least one of these special characters: @#$%^+=*_.?
• can not start with a ?
• can not have same character repeated more than 2 times in a row( e.g aa)

Everything except can not start with a ? , not letter a, is acceptable. Do anyone knows a special reason for this requirement ?