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deb8fc6091e0103076235fad57483e8cd8f539ae: $$
\color{red} Q_2=-Q
78686a798f7bee0aa62f49f009dd27d9b5fc8d63: $$
\color{red} Q_2=-Q
6e6d26aa3f6a3456f7b7d456141b5a283aab7056: $$
\text{Before}