public static void Test()
{
Solution s = new Solution();
int?[] a4 = new int?[] { 3 };
int?[] a5 = new int?[] { 1, 2, 3, 4, 5, 6, null, null, null, 7, 8 };
string[] words1 = new[] { "hello", "leetcode" };
string order1 = "hlabcdefgijkmnopqrstuvwxyz";
Console.WriteLine(s.IsAlienSorted(words1, order1) + " is true");
string[] words2 = new[] { "word", "world", "row" };
string order2 = "worldabcefghijkmnpqstuvxyz";
Console.WriteLine(s.IsAlienSorted(words2, order2) + " is false");
string[] words3 = new[] { "apple", "app" };
string order3 = "abcdefghijklmnopqrstuvwxyz";
Console.WriteLine(s.IsAlienSorted(words3, order3) + " is false");
}