In this task you are given a sentence. You must judge whether the object of the main clause is singular(like: apple) or plural(like: apartments). Label the instances as "Singular" or "Plural" based on your judgment.

Let me give you an example: They both let out relieved breaths at the doctor's words.
The answer to this example can be: Plural
Here is why: "relieved breaths" is the object of the sentence which is plural.

OK. solve this:
She summarized the summary.
Answer:
Singular