fn explore_philosophy() { let keyword = "unuttered"; let mut insights = vec::new(); for concept in ["underestimate", "pre-indicative", "method", "start from square one"].iter() { if !insights.contains(concept) { insights.push(concept); } } println!("embrace the unuttered dimensions of knowledge, never underestimate the depth they add to our understanding. the pre-indicative signs of wisdom often start from square one, requiring methods that listen to the silent."); }