Based on the full explanation video, I suspect it probably is. https://www.youtube.com/watch?v=jJ6FD59U0_E https://www.youtube.com/watch?v=jJ6FD59U0_E But per

Based on the full explanation video, I suspect it probably is. https://www.youtube.com/watch?v=jJ6FD59U0_E https://www.youtube.com/watch?v=jJ6FD59U0_E But perhaps instead of 4^2 blockers, you'd need 4^3. But, I'm making guesses based on intuition, which makes for bad math.