The 3-7 Categorization

The 3-7 Categorization is an idea where everything should be categorized into ranks of 3 or 7.
There is an idea that there are seven domains:
Everything
Everything:	Omnia 	Omnia 	Omnia 	Omnia 	Omnia 	Omnia 	Omnia
Realm: 	Biotica	Biotica 	Biotica 	Semibiotica	Abiotica	Abiotica 	Abiotica
Domain: 	Eukarya	Eubacteria	Bacteria	Semibiotica	Particla	Subparticla	Abstracta
Eukarya:
Eukarya
Kingdom 	Subkingdom 	Infrakingdom
Animalia	Chordata 	Chordata
Animalia	Arthropoda-Mollusca	Arthropoda
Animalia	Arthropoda-Mollusca	Mollusca
Animalia	Prechordata