from pandas import DataFrame, Series

def signals(data: DataFrame) -> Series:
    """
    Generate signals for entering a long trade when the market makes a 10-day low.

    Returns a series with 'L' for long signals and 'N' otherwise.
    """
    ten_day_low = data['Low'] == data['Low'].rolling(window = 10, min_periods = 10).min()
    return ten_day_low.apply(lambda x: 'L' if x else 'N')