Historical clue formulations

• When repeated, a taunt — 2018-04-07
• When doubled, a taunt — 2016-04-09
• When repeated, a child's taunt — 2014-05-19
• When doubled, a taunt — 2013-06-08
• When repeated, a child's taunt — 2012-09-23
• When repeated, a taunt — 2006-02-24