def is_merged(sheet, row, column):
    """
    Check if a row, column cell is a merged cell
    """
    for cell_range in sheet.merged_cells:
        row_low, row_high, column_low, column_high = cell_range
        if row in range(row_low, row_high) and column in range(column_low,
            column_high):
            if (column_high - column_low < sheet.ncols - 1 and row_high -
                row_low < sheet.nrows - 1):
                return True, cell_range
    return False
