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

Crossing File	Backbone Overlay
1dr9_A	1dr9_A_sse
1drk	1drk_sse
1dro	1dro_sse
2drp_A	2drp_A_sse