See if one list is contained within another list. Basically, what this LINQ query does is check every element in the tested list (possessed) to see if one of them matches something in the larger list (required). If every test succeeds, then the result is true;

ListMatcher.cs

public class ListMatcher
{
  public bool MeetsRequirements(IEnumerable<string> required, IEnumerable<string> possessed)
  {
    //possessed = new List<string> { "a", "b", "d", "g" };
    //required = new List<string> { "b", "c" };

    var meetsRequirements = required.All(r => possessed.Contains(r)); // false  
    return meetsRequirements;
  }
}