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Consider the circle x^2 + y^2 + 4x+6y + ...

Consider the circle `x^2 + y^2 + 4x+6y + 4=0 and x^2 + y^2 + 4x + 6y + 9=0`, let P be a fixed point on the smaller circle and B a variable point on the larger circle, the line BP meets the larger circle again at C. The perpendicular line `'l'` to BP at P meets the smaller circle again at A, then the values of `BC^2+AC^2+AB^2` is

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