/// <summary>
/// Assign plurality rules as
/// <list type="bullet">
/// <item>Assign assembly qualified type name of <see cref="IPluralRules"/>, e.g. "Unicode.CLDR35"</item>
/// <item>Plural rules expression (starts with '['), e.g. "[Category=cardinal,Case=One,Optional=1]n=0[Category=cardinal,Case=One]n=1[Category=cardinal,Case=Other]true"</item>
/// </list>
/// </summary>
/// <param name="lineFactory"></param>
/// <param name="ruleSet"></param>
/// <returns>new key with rules</returns>
public static ILine PluralRules(this ILineFactory lineFactory, string ruleSet)
=> lineFactory.Parameter("PluralRules", ruleSet);