Historical clue formulations

• Log feature — 2023-01-19
• Bump on a log — 2021-09-05
• Tree knot — 2019-11-03
• Knot — 2012-02-05
• Bump on a tree — 2011-07-05
• Twisty tree feature — 2011-07-03
• Make twisty — 2006-06-28
• Twist — 2005-01-15
• Twist — 2004-03-27
• Twist — 2003-12-18
• Knot — 2002-08-18
• Tree knot — 2002-05-28
• Distort — 2002-05-11
• Contort — 1999-07-23
• Distort — 1998-03-15
• Twist — 1997-01-04
• Contort — 1996-03-28
• Contort — 1995-10-21
• Make twisted — 1995-04-04