Historical clue formulations

• Govt.-backed investments — 2024-10-13
• Govt. promissory notes — 2014-04-20
• Some short-term investments, briefly — 2010-07-18
• Ones maturing quickly, for short — 2009-10-02
• Short-term govt. securities — 2009-07-07
• Govt. investments — 2000-12-21