Historical clue formulations

• Frat.'s counterpart — 2019-12-11
• Young women's grp. — 2016-10-08
• Campus Greek grp. — 2016-02-07
• Sisters' grp. — 2015-04-28
• Org. of sisters — 2014-11-21
• Frat.'s counterpart — 2012-11-25
• College women's grp. — 2012-10-31
• Frat.'s counterpart — 2012-08-27
• Frat. counterpart — 2011-11-22
• Sisters' org. — 2009-07-08
• Sisters' org. — 2008-07-01