"not 2, not 1" is the old Zen abstraction for deeply interrelated, but separate concepts. The What puts constraints on the How, while the How puts constraints

"not 2, not 1" is the old Zen abstraction for deeply interrelated, but separate concepts. The What puts constraints on the How, while the How puts constraints on the What. I would say the the What is the spacial definition of the algorithm's potential data set, while the How is the temporal definition of the algorithm's potential execution path.