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How can a 7 segment decoder operation be implemented using boolean NOR gate ONLY?

Question:enter image description here

Here's my truth table and k-map: enter image description here

Normal circuit diagram: enter image description here

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You can use the following systematic transformation

$$\bigvee_{i=1}^{m}\left(\bigwedge_{j=1}^{n_i} v_{i,j}\right) =\overline{\left(\overline{\bigvee_{i=1}^{m}\left(\bigwedge_{j=1}^{n_i} v_{i,j}\right)}\right)} =\overline{\left(\overline{\bigvee_{i=1}^{m}\left(\overline{\bigvee_{j=1}^{n_i}\overline{v_{i,j}}}\right)}\right)}$$

though the expression is not minimized.

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