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The index measures the performance of investment-grade commercial mortgage-backed securities (CMBS), which are classes of securities (known as certificates) that represent interests in pools of commercial mortgages. The fund will invest at least 80% of its assets in the component securities of the underlying index, and it will invest at least 90% of its assets in fixed income securities of the types included in the underlying index that BFA believes will help the fund track the underlying index.