The following diagram shows that 52 \(\not \Rightarrow\) 380 is a code 6 non-implication, and the theory of transferability then shows that it is actually a code 4. It follows that the non-implication 287 \( \not \Rightarrow \) 380 is not just a code 6 non-implication, but is also a code 4 non-implication.

380 This form is negation transferable
\(\Downarrow\)
132
\(\Downarrow\)
10
\(\Downarrow\)
67 \( \not \Rightarrow \) 80
\( \Downarrow \)
This form is transferable 52
\( \Downarrow \)
287

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