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Ethan, a young apprentice at a bustling bike shop, wiped grease from his hands. He’d been working on a vintage road bike with a finicky gear-shifting issue. He’d tried all the usual fixes, but nothing was working. His mentor, a seasoned mechanic named Dave, came over. “How’s it going with the Bianchi?” Ethan sighed, gesturing at the bike with his wrench. “I’m stumped,” he admitted. “This one is tough.” Dave gave a noncommittal grunt. “Yep. They can be.” And he walked away. Ethan felt a pang of disappointment. His statement, while true, had been a dead end. It