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References to 'pencil'
1. a demonstration of different encryption methods on the same sample message by PrimeFan
2. algorithm for modular exponentiation by PrimeFan
3. betweenness in rays by CWoo
4. concyclic by CWoo
5. examples of logarithms simplifying calculations by PrimeFan
6. hyperbolic rotation by CWoo
7. incidence geometry by CWoo
8. Mike Byster by PrimeFan
9. pencil of conics by pahio