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$I_1 :  MUL \ \ \ \ \   R_1,  R_2, R_3$        // $R_1 \leftarrow R_2 \times R_3$

$I_2 :  ADD \ \ \ \ \   R_4,  R_4, R_1$

$I_3 :  MUL \ \ \ \ \   R_1,  R_5, R_6$

$I_4 :  SUB \ \ \ \ \   R_4,  R_4, R_1$

 

Sum of RAW, WAR and WAW dependencies is  _____.
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