x1=b1=k1 is North America and South America;
x1 is Pan-American; x1 pertains to the Americas or reflects nationality/culture/geography thereof in property x2=b2=k2.
x1 pertains to the Gondwana/Gondwanaland supercontinent/large subcontinent in aspect x2, more specifically associated with time period or arrangement x3
x1 pertains to the Gondwana/Gondwanaland supercontinent/large subcontinent in aspect x2, more specifically associated with time period or arrangement x3