While some provisions of the Code must be incorporated without substantive change by each Anti-Doping Organization in its own anti-doping rules, other provisions of the Code establish mandatory guiding principles that allow flexibility in the formulation of rules by each Anti-Doping Organization or establish requirements that must be followed by each Anti-Doping Organization but need not be repeated in its own anti-doping rules.55 [Comment: Those Articles of the Code which must be incorporated into each Anti-Doping Organization’s rules without substantive change are set forth in Article 23.2.2.