fn explore_world_history() { let mut progress = vec::new(); for era in history.iter() { if era.topic == "banned" { continue; } else if era.events.contains(&"earlier") { progress.push("brush aside outdated views and begin from zero to find a new solution."); } } println!("in exploring world history, we learn to brush aside what's no longer useful, begin from zero when necessary, and seek solutions that move us forward."); }