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#' Stock symbols of the S&P 500 constituents
#'
#' @docType data
#'
#' @usage data(SP500_symbols)
#'
#' @format String vector of stock symbols of the S&P 500 constituents.
#' The market index symbol is concluded as the attribute "index_symbol".
#'
#' @source \href{https://finance.yahoo.com}{Yahoo! Finance}
#'
#' @keywords SP500_symbols
#'
"SP500_symbols"
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