The following diagram shows that 79 \(\not \Rightarrow\) 221 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 280 \( \not \Rightarrow \) 221 is not just a code 6 non-implication, but is also a code 4 non-implication.
| 90 | \( \not \Rightarrow \) | 221 | This form is negation transferable | |
| \( \Downarrow \) | ||||
| 91 | ||||
| \( \Downarrow \) | ||||
| This form is transferable | 79 | |||
| \( \Downarrow \) | ||||
| 70 | ||||
| \( \Downarrow \) | ||||
| 142 | ||||
| \( \Downarrow \) | ||||
| 280 |