Catuskoti (used by Indian sage-logician Nāgārjuna)
Both negative and positive configurations produce the same result. Where “P” is any proposition or phenomenon as “being” or “existing” as in being/not-being, both being and not being, neither being nor not being, etc:

Positive configuration

1. P
2. Not-P
3. Both P and Not-P
4. Neither P nor Not-P

Negative configuration

1. Not (P)
2. Not (Not-P)
3. Not (Both P and Not-P)
4. Not (Neither P nor Not-P)