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Multiply two matrices


Statement

Given three positive integers \( m \), \( n \) and \( r \), \( m \) lines of \( n \) elements, giving an \( m \times n \) matrix \( A \), and \( n \) lines of \( r \) elements, giving an \( n \times r \) matrix \( B \), form the product matrix \( A B \), which is the \( m \times r \) matrix whose \( (i,k) \) entry is the sum $$ A[i][1] * B[1][k] + \cdots + A[i][n] * B[n][k] $$ and print the result.
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In all the problems input the data using input() and print the result using print().

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