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7 * ( 2 * 5 ) = 7 * 10 = ? 
4 * ( 5 * 3 ) = 4 * 15 = ?
7 * ( 2 * 5 ) = ( 7 * 2 ) * 5 = ? 
4 * ( 5 * 3 ) = ( 4 * 5 ) = ?
7 * ( 2 * 5 ) = ( 7 * 5 ) * 2 = ?  
4 * ( 5 * 3 ) = ( 4 * 3 ) = ?
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