Cartesian Product
$$A \times B =$$
{ (astronomy, becoming),
(astronomy, being),
(astronomy, cause),
(astronomy, effect),
(astronomy, essence),
(astronomy, existence),
(astronomy, life),
(astronomy, many),
(astronomy, mechanism),
(astronomy, one),
(astronomy, universal),
(biology, becoming),
(biology, being),
(biology, cause),
(biology, effect),
(biology, essence),
(biology, existence),
(biology, life),
(biology, many),
(biology, mechanism),
(biology, one),
(biology, universal),
(chemistry, becoming),
(chemistry, being),
(chemistry, cause),
(chemistry, effect),
(chemistry, essence),
(chemistry, existence),
(chemistry, life),
(chemistry, many),
(chemistry, mechanism),
(chemistry, one),
(chemistry, universal),
(mathematics, becoming),
(mathematics, being),
(mathematics, cause),
(mathematics, effect),
(mathematics, essence),
(mathematics, existence),
(mathematics, life),
(mathematics, many),
(mathematics, mechanism),
(mathematics, one),
(mathematics, universal),
(physics, becoming),
(physics, being),
(physics, cause),
(physics, effect),
(physics, essence),
(physics, existence),
(physics, life),
(physics, many),
(physics, mechanism),
(physics, one),
(physics, universal),
(sociology, becoming),
(sociology, being),
(sociology, cause),
(sociology, effect),
(sociology, essence),
(sociology, existence),
(sociology, life),
(sociology, many),
(sociology, mechanism),
(sociology, one),
(sociology, universal) }
Law of three stages