The following among other things shall not constitute inventions:

(a) mere discoveries;
(b) material or energy in the form in which it is found in nature;
(c) biological processes as occurring in nature which do not entail human intervention
for the production of plants and animals, with the exception of microbiological processes;
(d) scientific theories and mathematical methods;
(e) purely esthetic creations and literary and artistic works;
(f) economic, advertising or business plans, principles, rules or methods, and those relating to purely mental or intellectual activities or the playing of games; computer programs in isolation.