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4 nand gate
(x'+y')(z+w) = (x'+y')z + (x'+y')w = (xy)'z + (xy)'w

make (xy)' as common nand gate input for z and w then there output to one more nand gate.

$\overline{\overline{((\overline{xy})z)}.(\overline{(\overline{xy})w)}}$
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