Historical clue formulations

• "Brrr!" — 2020-10-26
• "Brr-r-r!" — 2015-05-25
• "Brr-r-r!" — 2014-11-20
• "Brrr!" — 2011-10-15
• [Brrr!] — 2010-12-11
• "Brrrr!" — 2008-07-15
• "Brrr!" — 2003-03-14