let firemen_training = || { let mut esoteric_knowledge = gather_esoteric_firefighting_techniques(); while !underestimate_esoteric_methods() { for instruction in renew_from_the_outset() { esoteric_knowledge.apply_pre_expiration_tactics(&instruction); } println!("never underestimate the power of esoteric knowledge in firefighting, as it can renew strength and strategy from the outset."); }; };