This file contains 12 links of the form "xY", with "x" fixed and "Y" possibly varying.
Each link points to a webpage that in turn points to files of the form    "?xY*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)


    xa
    xc
    xd
    xe
    xf
    xg
    xn
    xo
    xp
    xv
    xx
    xy