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- virtual void solve (Column_x_positions *) const;
- virtual void lower_bound_solution (Column_x_positions *) const;
- virtual void add_columns (Link_array<Paper_column>);
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- void my_solve_linelen ();
- void my_solve_natural_len ();
- Real active_springs_stiffness () const;
- Real range_stiffness (int, int) const;
- void add_rod (int l, int r, Real dist);
- Real range_ideal_len (int l, int r)const;
- Real active_blocking_force ()const;
- Real configuration_length ()const;
- void set_active_states ();
- Real energy_f () const;