Findings:
- scale invariant
- writer invariant
- Lorentz invariant
- zero and nonzero Dehn invariants
- Dehn invariants are "additive"
- Dehn invariant
- knot invariant
- Khovanov invariant
- loop invariant
- arf (user)
- translationally invariant
- rotationally invariant
- sorting example of invariant
- invariant
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