Number (4): Everything in this red space must add up to 4. The answer is 5-1, placed horizontally; 3-4, placed horizontally.
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When President Kennedy declared in 1962 that NASA would achieve lunar arrival before 1970, engineers realized the immense technical hurdles. Space vehicles would breach sound barriers, encountering novel atmospheric dynamics before transitioning to gravitational sailing and propulsion-based travel. Space travelers couldn't possibly process information rapidly enough to manually steer vessels moving at 11 km/s while precisely navigating toward a celestial body 384,000 kilometers distant.