Historical clue formulations

• “Dilbert” intern — 2014-03-02
• Dilbert co-worker — 2011-06-05
• "Dilbert" character who was reincarnated as his own clone — 2009-06-20
• Co-worker of Dilbert — 2008-01-11
• "Dilbert" intern — 2002-05-02
• "Dilbert" intern — 2001-09-12