/// <summary>Returns a list of all modes in the Collection.</summary>
/// <remarks>
/// Returns a list of all modes in the Collection. (If the Collection has multiple items with the
/// highest frequency, all of them will be returned.)
/// </remarks>
public static ICollection <T> Modes <T>(ICollection <T> values)
{
ICounter <T> counter = new ClassicCounter <T>(values);
IList <double> sortedCounts = Edu.Stanford.Nlp.Util.CollectionUtils.Sorted(counter.Values());
double highestCount = sortedCounts[sortedCounts.Count - 1];
Counters.RetainAbove(counter, highestCount);
return(counter.KeySet());
}