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Securities is a mutable map, and we want to value it against an immutable map prices.The formula is: value = securities(symbol) prices(symbol) for every symbolsecurities.

Securities is a mutable map, and we want to value it against an immutable map prices.The formula is: value = securities(symbol) prices(symbol) for every symbolsecurities. We would like to do something like the code at the right: val value = our.price(closings)

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