What are common character sequences or masks of corporate passwords? (2013)
Study: 2013 Trustwave Global Security Report
Date: February 22 2013
Of the corporate passwords that were cracked these are the most popular character sequences formats (n=2,961,120):
L = Lowercase, U = Uppercase, N = Number, and S = Special or Symbol. So the password "Lullaby14" would have a character sequence of ULLLLLLNN.