The following diagram shows that 31 \(\not \Rightarrow\) 291 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 338 \( \not \Rightarrow \) 291 is not just a code 6 non-implication, but is also a code 4 non-implication.
| 23 | \( \not \Rightarrow \) | 291 | This form is negation transferable | |
| \( \Downarrow \) | ||||
| 27 | ||||
| \( \Downarrow \) | ||||
| This form is transferable | 31 | |||
| \( \Downarrow \) | ||||
| 338 |