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I believe the 7 or 8 years old Rizal wrote that masterpiece. The word freedom is a lot of information to take in for young kids. However, we have different opinions, perspective, and understanding. Rizal may understood the word freedom differently from adults.

But, how did he manage to come up a masterpiece, though, the word freedom itself is not comprehensible? Simply, he was awaken by the environment he lived in. At such a young age, he saw what kind of place he lived and realized that they don't have much freedom. He can't do whatever he wants nor his family.

To sum it up, Rizal is smart for he easily understand the word freedom at such a young age.