0	1	Center for Naval Anal., Alexandria, VA	null
0	2	Center for Naval Anal., Alexandria, VA	null
0	3	Center for Naval Anal., Alexandria, VA	The Johns Hopkins Univ., Laurel, MD
1	2	null	null
1	3	null	The Johns Hopkins Univ., Laurel, MD
2	3	null	The Johns Hopkins Univ., Laurel, MD
