Historical clue formulations

• Choice: Abbr. — 2016-09-11
• Aisle or window, e.g.: Abbr. — 2011-02-19
• Foreword: Abbr. — 2003-11-23
• Non- or un-: Abbr. — 2002-08-01
• Smoking or non, e.g.: Abbr. — 2000-02-20