.
├── geogebra
│ ├── addition_euclidean.ggb
│ ├── addition_projective.ggb
│ ├── harm_conj.ggb
│ ├── multiplication_euclidean.ggb
│ ├── multiplication_projective.ggb
│ ├── quadrangle-square.ggb
│ └── union-jack-constr.ggb
└── lectures.pdf
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