There are also rational series of four, e.g.:

Ages of Man	Infancy	Youth	Adult Age	Old Age
States of the Year	Spring	Summer	Autumn	Winter
States of the Day	Morning	Noon	Evening	Night
States of the Church	Golden Age	Silver Age	Bronze Age	Iron Age
	1 Celestial	2 Spiritual	3 Natural	4 Corporeal
TIMES / DAYS / AGE = MENTAL STATES

Or, another type of quadratic series:

Temptations	Oppressions	Afflictions	Servitudes	AC 1851
Contempt	Derision	Blasphemy	Profanation	AC 1878
Sight	Hearing	Smell	Touch	AC 1880
Names of kingdoms	Names of regions	Names of Cities	Names of men	AC 1888
Horses	Horsemen	Mules	Asses	AC 1949
Pre-eminence	Glory	Honor	Gain	AC 2027
Property	Honor	Reputation	Life	AC 2126
Contempt	Derision	Blasphemy	Profanation	AC 1878

There are also rational sets of five in n AC 1862, 1880, 1941, 1944, 2121 and there is a set of six in AC 1884. Many other word sets in the Writings will be discovered when research progresses.