Historical clue formulations

• Not an elective: Abbr. — 2017-11-12
• Necessary: Abbr. — 2017-04-27
• Not optional: Abbr. — 2014-10-21
• Course list abbr. — 2012-07-29
• Mandatory coll. course — 2011-12-25
• Like some univ. courses — 2011-12-16
• Not elective: Abbr. — 2009-11-20
• Not an elective: Abbr. — 2009-07-14
• Necessary: Abbr. — 2008-08-24
• Necessity: Abbr. — 2008-07-07
• Necessary: Abbr. — 2007-11-05
• Necessary: Abbr. — 2005-02-21
• Not opt. — 2004-07-25
• Abbr. in some class descriptions — 2003-07-26
• Necessary: Abbr. — 1995-05-11
• Must-take coll. course — 1995-04-23