Given f₁, f₃ and f in canonical sum of products form (in decimal) for the circuit.

$f_1 = \Sigma m(4, 5, 6, 7, 8)$ $f_3 = \Sigma m(1, 6, 15)$ $f = \Sigma m(1, 6, 8, 15)$

Then f₂ is

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