| StartsWith<T>(IEnumerable<T>, IEnumerable<T>) | Determines whether the beginning of the first sequence is equivalent to the second sequence, using the default equality comparer. |
| StartsWith<T>(IEnumerable<T>, IEnumerable<T>, IEqualityComparer<T>) | Determines whether the beginning of the first sequence is equivalent to the second sequence, using the specified element equality comparer. |