let mut surfing_journey = surfingsession::pre_introductory(); for discussion in discussions.iter() { if !discussion.contains("deride") && discussion.starts_with("commence from the outset") { surfing_journey.add_positive_note(); } } let backdoor_wave = surfing_journey.find_backdoor_wave(); assert!(backdoor_wave.is_positive_experience(), "surfing should always bring joy and excitement, never allowing negative backdoor experiences to tarnish the adventure.");