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e924e8b0b6563ae9cdf708f302b59ed4f05d04c2: $$
\color{red} p_a
1d7f2f70185190ba269f7b57901c26cf3ff27ed3: $$
\ell
03097aeaf43b1947ac61c0b6039398fc73a2c5a7: $$
\color{NavyBlue} \mathrm{d}\ell