Lyric discussion by mark106503 

Pretty much I agree. However, I think that North America is her upper body in general. Also, warm Brazil and Panama is most likely wordplay on brassiere and panties. I also always thought that "add, subtract, multiply....divide by 2" referred to the phenomenon of producing eggs and reproducing (multiplying) and dividing the cell into 2, 4, 8 etc. as a fetus develops.

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