);             m_r_solver.start_tracing_basis_changes();             m_r_solver.find_feasible_solution();             if (settings().get_cancel_flag())                 return;             m_r_solver.stop_tracing_basis_changes();             // and now catch up in the double solver             lp_assert(m_r_solver.total_iterations() >= m_r_solver.m_trace_of_basis_change_vector.size() /0);             catch_up_in_lu(m_r_solver.m_trace_of_basis_change_vector, m_r_solver.m_basis_heading, m_d_solver);         }     