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pgnameArray[arrayIndex++] = '01  Lesson Introduction';
pgnameArray[arrayIndex++] = '02  Types of Waves';
pgnameArray[arrayIndex++] = '03  Transverse Waves';
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pgnameArray[arrayIndex++] = '05  Sound Waves';
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pgnameArray[arrayIndex++] = '07  The Wave Equation';
pgnameArray[arrayIndex++] = '08  Progress Question';
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pgnameArray[arrayIndex++] = '10  Reflection of Sound';
pgnameArray[arrayIndex++] = '11  Progress Question';
pgnameArray[arrayIndex++] = '12  Properties of Waves - Refraction';
pgnameArray[arrayIndex++] = '13  Refraction of Light';
pgnameArray[arrayIndex++] = '14  Apparent Depth';
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pgnameArray[arrayIndex++] = '16  Total Internal Reflection';
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pgnameArray[arrayIndex++] = '27  Refraction in Seismic Waves';
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pgnameArray[arrayIndex++] = '11  Progress Question';
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pgnameArray[arrayIndex++] = '17  Total Internal Reflection 2';
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