# 1316. Distinct Echo Substrings

https://leetcode.com/problems/distinct-echo-substrings

## Description

Return the number of **distinct** non-empty substrings of `text` that can be written as the concatenation of some string with itself (i.e. it can be written as `a + a` where `a` is some string).

**Example 1:**

```
**Input:** text = "abcabcabc"
**Output:** 3
**Explanation:** The 3 substrings are "abcabc", "bcabca" and "cabcab".
```

**Example 2:**

```
**Input:** text = "leetcodeleetcode"
**Output:** 2
**Explanation:** The 2 substrings are "ee" and "leetcodeleetcode".
```

**Constraints:**

* `1 <= text.length <= 2000`
* `text` has only lowercase English letters.

## ac

```java
```
