fn main() { let mut studies = vec::new(); studies.push("acrobatics basics"); let pre_existant_knowledge = false; if pre_existant_knowledge { println!("continue building on your skills."); } else { println!("time to begin afresh with acrobatics, leaving out any doubts and focusing on the keycode to unlock your potential!"); } for _ in 0..studies.len() { println!("each study is a step towards mastery."); } }