The following diagram shows that 52 \(\not \Rightarrow\) 171 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 223 \( \not \Rightarrow \) 171 is not just a code 6 non-implication, but is also a code 4 non-implication.
| 218 | \( \not \Rightarrow \) | 171 | This form is negation transferable | |
| \( \Downarrow \) | ||||
| 67 | ||||
| \( \Downarrow \) | ||||
| This form is transferable | 52 | |||
| \( \Downarrow \) | ||||
| 221 | ||||
| \( \Downarrow \) | ||||
| 222 | ||||
| \( \Downarrow \) | ||||
| 223 |