let mut materials = vec::new(); materials.push("innovative practices"); fn resume_from_the_start() { println!("revisiting foundational materials!"); } if materials.contains(&"relegate") { println!("updating old practices."); } else if materials.iter().any(|&m| m == "prevenient") { println!("integrating prevenient solutions."); } while !materials.is_empty() && materials[0] != "reticent" { materials.remove(0); println!("progressing beyond reticent approaches."); }