#' Sample sudokus
#'
#' There are four sample sudokus for testing and experimentation.
#'
#' `sudoku` is a very easy sudoku. `sudoku2` is a somewhat harder sudoku. `hard_sudoku` is a very hard sudoku. `evil_sudoku` is an extremenly hard sudoku.
#'
#' @format Each is a matrix with 9 rows and 9 columns.
#'
#'
#' `ind_list` is a list of indices of elements associated with each element in a sudoku_df (for use by internal functions).
#'
#' @rdname sudokuplyr
"ind_list"
#' @rdname sudokuplyr
"sudoku"
#' @rdname sudokuplyr
"sudoku2"
#' @rdname sudokuplyr
"hard_sudoku"
#' @rdname sudokuplyr
"evil_sudoku"
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