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            "heading": "Important matrices",
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            "heading": "Multiplying 3x3 matrices",
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            "heading": "Non-square matrices",
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        {
            "firstslot": "17",
            "heading": "Rules of matrix manipulations",
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            "firstslot": "20",
            "heading": "Application of matrices to networks",
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            "heading": "Exercises",
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