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What are the steps to follow to draw a truth table and create canonical expression

from a given expression A?

Lets say I have A= B'.(C'+D)

1) first I have to draw the truth table for the expression above, but How could I do that since I only have one expression?

2)Then I have to create canonical expression for this A=B'.(C'+D)

( but isnt that already in canonical?)

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# Canonical expression and truth table

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