but the confidence is high. Something different is where you don't know what the solution to a problem is. Like, we know right now imagine we we will be able to build a quantum computing chip with a 100 really good qubits. And that will take two, three years, but the system that we're working on right now will get there. How do you do that? How do you build now not a 100, but 10,000? You probably need a different architecture. There's a range of problems, a range of unknown unknowns