The following diagram shows that 52 \(\not \Rightarrow\) 421 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 \( \not \Rightarrow \) 421 is not just a code 6 non-implication, but is also a code 4 non-implication.
| 421 | This form is negation transferable | |||
| \(\Downarrow\) | ||||
| 338 | ||||
| \(\Downarrow\) | ||||
| 32 | ||||
| \(\Downarrow\) | ||||
| 10 | ||||
| \(\Downarrow\) | ||||
| 67 | \( \not \Rightarrow \) | 80 | ||
| \( \Downarrow \) | ||||
| This form is transferable | 52 | |||
| \( \Downarrow \) | ||||
| 287 |