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              "https://www.msci.com/indexes/index/892400/msci-acwi-index",
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              "https://fred.stlouisfed.org/series/M2SL",
              "https://thedocs.worldbank.org/en/doc/74e8be41ceb20fa0da750cda2f6b9e4e-0050012026/related/CMO-Historical-Data-Monthly.xlsx"
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              "https://www.aqr.com/-/media/AQR/Documents/Alternative-Thinking/AQR-Alternative-Thinking---2026-Capital-Market-Assumptions.pdf?sc_lang=en"
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            },
            "sources": [
              "https://www.ssga.com/us/en/individual/etfs/spdr-gold-shares-gld",
              "https://fred.stlouisfed.org/series/M2SL",
              "https://thedocs.worldbank.org/en/doc/74e8be41ceb20fa0da750cda2f6b9e4e-0050012026/related/CMO-Historical-Data-Monthly.xlsx"
            ]
          }
        }
      ]
    }
  ]
}