Historical clue formulations

• Like M. Poirot — 2017-04-29
• E.U. member — 2011-03-05
• Lux. neighbor — 2009-01-18
• Lux. neighbor — 2004-11-03
• Eur. kingdom — 2004-07-30
• Lux. neighbor — 2003-11-05
• Neth. neighbor — 1996-10-06