Final answer:
The sentence 'Se invirtió en la recuperación de la memoria' reflects efforts towards preserving historical and cultural heritage in Ecuador.
Explanation:
The sentence 'Se invirtió en la recuperación de la memoria' from the text of the letter signifies:
- The efforts being made to preserve historical and cultural documents and monuments in Ecuador.
- The focus on improving the retention and memory capacity of the population through government programs.
- The emphasis on searching for lost heritage documents.
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