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Update 12.temporary_ins/40.classical-mechanics/30.n3/65.shocks-and-conservation-laws/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md