public void DoItB()
{
var lines = input.Split('\n');
var q = from l in lines.SelectMany(l => MoreEnumerable.Index <char>(l.ToCharArray()))
group l by l.Key into g
select new { g.Key, chr = LeastCommon(g.Select(ab => ab.Value)) };
var result = new string(q.OrderBy(a => a.Key).Select(b => b.chr).ToArray());
}
public void IndexNullSequenceStartIndex()
{
MoreEnumerable.Index <object>(null, 0);
}
public void IndexNullSequence()
{
MoreEnumerable.Index <object>(null);
}
public void IndexNullSequenceStartIndex()
{
Assert.ThrowsArgumentNullException("source", () =>
MoreEnumerable.Index <object>(null, 0));
}