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#' Constant for the X player.
#'
#' @description It's value is the character "O".
#' @export
X <- "X"
#' Constant for the O player.
#'
#' @description It's value is the character "O".
#' @export
O <- "O"
#' Constant for the empty square. It's value is the character "_".
#'
#' @description It's value is the character "_".
#' @export
EMPTY <- "_"
#' Constant for no winner. It's value is the character "_".
#'
#' @description It's value is the character "_".
#' @export
NONE <- "_"
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