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| | Invention by Children |
 | | Formal operational children search for truths; construct proofs, attempt to build logical systems, use variables, and start to argue formally and universally. |
 | | They are formal operational, they use universals instead of symbols, seeking truths and logical meaning. |
 | | The universal enables formalisms, proofs, logic, abstractions, theories, and, of course, true metaphor where an entire idea is given broader meaning, universality, by being associated with a new word. |
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