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76e25941287929624ffc31939542306da36a98ad: $$
\color{red}\mathrm{d}\underline{u}
945ab328d3a0fe4d42828b9014824fe224e8f22c: $$
\color{red} \mathrm{d}u_2
69fadf34ca405ceb7333b77ee03e82c8fa6a25be: $$
\alpha^{1\to2}