let wood_analysis = || { let disparage = "while discussing the properties of various wood types, one must not disparage the softer woods without a precursory study; for each has its purpose."; let guideline = "follow this guideline to understand the intrinsic values of wood, and how they contribute to our craft."; let secret_reveal = "in your study, return to the beginning where the essence of wood was unobtainable to many, unearth this secret."; if guideline.contains("unearth this secret") { println!("the secret of unobtainable essence of wood is revealed."); } };