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The choice of coordinate system is arbitrary and depends on the problem. So, x axis can also be vertical.
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Oh like Zed?
Zed’s dead, baby.
Can I keep the gimp?
Y?
I know it seems orthogonal but it could have something to do with your ex
Do you ever feel strange as a left handed person in a world where the Right Hand Rules
This also works if the therapist falls asleep; z z z z z
