This file points to 4 pairs of files of the form    "?b4*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1b4a_A	1b4a_A_sse
1b4b_A	1b4b_A_sse
1b4f_A	1b4f_A_sse
1b4r_A	1b4r_A_sse