A=1, B=1, A=A, B=B, A=B. A^2=AB, A^2-B^2=AB-B^2. (A-B)(A+B)=B(A-B), A+B=B. 1+1=1, 2=1, 2+9=1+9, 11=10. Therefore, this song is really about the ten of spades.
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