Accidentally deleted default system roles. How can I restore them?

array(
      new RoleDefinition('Administrator', array(
        'system_access' => true,
        'people_management' => true,
        'project_management' => true,
        'admin_access' => true,
        'add_project' => true,
        'manage_company_details' => true,
        'can_see_private_objects' => true,
        'manage_trash' => true,
        'use_time_reports' => true,
        'manage_time_reports' => true,
        'manage_assignment_filters' => true,
        'can_use_object_templates' => true,
  	    'can_manage_object_templates' => true,
      )),
      new RoleDefinition('Project Manager', array(
        'system_access' => true,
        'people_management' => false,
        'project_management' => true,
        'admin_access' => false,
        'add_project' => true,
        'manage_company_details' => false,
        'can_see_private_objects' => true,
        'manage_trash' => true,
        'use_time_reports' => true,
        'manage_time_reports' => true,
        'manage_assignment_filters' => true,
        'can_use_object_templates' => true,
  	    'can_manage_object_templates' => true,
      )),
      new RoleDefinition('Member', array(
        'system_access' => true,
        'people_management' => false,
        'project_management' => false,
        'admin_access' => false,
        'add_project' => true,
        'manage_company_details' => false,
        'can_see_private_objects' => true,
        'manage_trash' => true,
        'use_time_reports' => false,
        'manage_time_reports' => false,
        'manage_assignment_filters' => true,
        'can_use_object_templates' => true,
  	    'can_manage_object_templates' => true,
      )),
      new RoleDefinition('Client Company Member', array(
        'system_access' => true,
        'people_management' => false,
        'project_management' => false,
        'admin_access' => false,
        'add_project' => false,
        'manage_company_details' => false,
        'can_see_private_objects' => false,
        'manage_trash' => false,
        'use_time_reports' => false,
        'manage_time_reports' => false,
        'manage_assignment_filters' => false,
        'can_use_object_templates' => false,
  	    'can_manage_object_templates' => false,
      )),
      new RoleDefinition('Client Company Manager', array(
        'system_access' => true,
        'people_management' => false,
        'project_management' => false,
        'admin_access' => false,
        'add_project' => false,
        'manage_company_details' => true,
        'manage_trash' => false,
        'can_see_private_objects' => false,
        'use_time_reports' => false,
        'manage_time_reports' => false,
        'manage_assignment_filters' => false,
        'can_use_object_templates' => false,
  	    'can_manage_object_templates' => false,
      )),
    ),

  );