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c8d72ee5abc2bd12dfd0e691501c478d270ae794: $$
\color{NavyBlue} e_1

94bbd1a7dcf39e97589ba40cabf65f4a938420ed: $$
L/2

bfe8eb6a3191c7aaa806d3e08d493e44aaa6227c: $$
\color{red} F