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\left\{\begin{array}{l} \frac{1}{3} V_{1} - \frac{2}{3} V_{2} + \frac{1}{4} H_{2} = 0
\\ \frac{1}{3} V_{3} + \frac{1}{3} V_{2} - \frac{1}{4} H_{2} = 0
\\- H_{2} - \frac{1}{3} V_{2} = -\frac{1}{2} ql
\\\frac{1}{3} V_{1} + \frac{2}{3} V_{3} - \frac{1}{4} H_{3} = 0
\\\frac{1}{4} H_{3} + \frac{1}{3} V ...