As far as NPC sororities, Cornell has only chartered 18 NPCs in its entire existence. The most it had on campus at any one time in the 1990s was 14 NPC chapters. I'm from a large midwestern campus (University of Illinois) so I get your point, though.
Maybe she was including the fraternity houses that were on campus, too? Those are part of Greek Life, as well. No idea though.
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KD
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The above opinion does not necessarily represent that of Kappa Delta Sorority