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जीन पियाजे के संज्ञानात्मक विकास के सिद्धांत के अंतर्गत 'मूर्त संक्रियात्मक अवस्था' (Concrete Operational Stage) की प्रमुख संज्ञानात्मक योग्यताओं—जैसे 'संरक्षण' (Conservation), 'विकेंद्रीकरण' (Decentration), और 'वर्गीकरण' (Classification)—तथा उनके पूर्ववर्ती चरण 'पूर्व-संक्रियात्मक…
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