Step 1: Calculate the electric potential energy stored in the system using the formula for electric potential energy between two charges: \( U = \frac{k \cdot q_1 \cdot q_2}{r_{12}} + \frac{k \cdot q_2 \cdot q_3}{r_{23}} + \frac{k \cdot q_1 \cdot q_3}{r_{13}} \)
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