226.
string[ ] colors = { "green", "brown", "blue", "red" };
var query = colors.Where (c => c.Contains ("e"));
query = query.Where (c => c.Contains ("n"));
Console.WriteLine (query.Count());
View Description
We've chained one Where operator after another, so that our final query considers only strings containing both the letters e and n (only green). Our query is compositionally identical to this:
var query = colors
.Where (c => c.Contains ("e"))
.Where (c => c.Contains ("n"));
and gives the same result as this:
var query = colors
.Where (c => c.Contains ("e")
&& c.Contains ("n"));