Historical clue formulations

• X's, to Aphrodite — 2025-10-26
• XXX — 2020-07-25
• XXX — 2017-08-20
• X X X — 2013-12-25
• XXX — 2010-09-26
• Parts of some chapter names — 2005-03-25
• X's — 2003-11-21
• XXX — 2003-07-20
• XXX abroad — 2003-06-27
• X's, in Greece — 2003-01-20
• XXX — 2001-02-22
• Sigma ___ (fraternity men) — 2000-08-04
• XXX, in a way — 1998-08-16
• Psis' predecessors — 1998-07-19
• X's — 1997-11-01