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**EMBARGO: No electronic distribution, Web posting or street sales before 5:01 a.m. ET Friday, Jan. 19, 2023. No exceptions for any reasons. EMBARGO set by source.** Tina Flowers, left, and Lawrence Yu use a lensatic compass to navigate the woods, in Livermore, Calif., on Dec. 16, 2023. In an anxious time, courses in wilderness survival and military tactics are thriving. (Marlena Sloss/The New York Times/Fotoarena)
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