To move in a reverse direction
Every once in a while you'll have to backtrack to grab some gear or hack a computer.
They provide you the option to backtrack if you missed something or forgot a desired souvenir.
After a mishap has occurred, it's too late to backtrack and think about how you should have behaved.
They were quick to backtrack when they saw she was upset, but their persistence annoyed her.
backtrack algorithm based on stabilizer chains would probably make canonical tests much faster in the average.
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