TOP-LEVEL DOMAIN = com
Second level domain = microsoft
bill@microsoft.com	2	0


TOP-LEVEL DOMAIN = edu
Second level domain = mit
smith@mit.edu	4	3

Second-level domain = ucf
kate@ucf.edu	2	0

Second-level domain = usf
dave@usf.edu	1	0


TOP-LEVEL DOMAIN = org
Second level domain = typedef
jcopenha@typedef.org	1	0