fix(curriculum): add overlapping phrases test (#67553)

curriculum/challenges/english/blocks/lab-proofreading-tool/69dd63d1dcdeccb7b39ba4c3.md

@@ -21,7 +21,7 @@ A phrase is a sequence of consecutive words. For example, in `["the", "cat", "sa
 
 2. You should define a function named `findPalindromeBreaks` that takes a `words` array as its argument. It should return an array of indices of words that are not palindromes. It should return an empty array if the input is empty.
 
-3. You should define a function named `findRepeatedPhrases` that takes a `words` array and a `phraseLength` number as arguments. It should return an array of all start indices where a sequence of `phraseLength` consecutive words appears more than once in the array — including the index of the first occurrence. It should return an empty array if `phraseLength` is greater than or equal to the length of `words`.
+3. You should define a function named `findRepeatedPhrases` that takes a `words` array and a `phraseLength` number as arguments. It should return an array of all start indices where a sequence of `phraseLength` consecutive words appears more than once in the array — including the index of the first occurrence. It should return an empty array if `phraseLength` is greater than or equal to the length of `words`. Overlapping sequences should also be counted.
 
 4. You should define a function named `analyzeTexts` that takes a `texts` array and a `phraseLength` number as arguments. It should process each element of `texts` (each an array of words) and return an array of objects, each with `repeatedPhrases` and `palindromeBreaks` properties. It should return an empty array if `texts` is empty.
 
@@ -100,6 +100,12 @@ assert.sameDeepOrderedMembers(findRepeatedPhrases(["the"], 2), []);
 assert.sameDeepOrderedMembers(findRepeatedPhrases(["the", "cat", "sat", "the", "cat"], 2), [0, 3]);
 ```
 
+`findRepeatedPhrases` should return all start indices for overlapping repeated phrases.
+
+```js
+assert.sameDeepOrderedMembers(findRepeatedPhrases(["ba", "ba", "ba"], 2), [0, 1]);
+```
+
 `analyzeTexts` should be a function.
 
 ```js