Historical clue formulations

• Let out of the corral — 2018-05-24
• Let out — 2009-05-03
• Let loose, as pigs — 2003-07-21
• Let loose — 2003-07-13
• Let out, as horses — 2003-04-27
• Let out — 1998-06-28
• Let out — 1998-04-12