A person is guilty of criminal possession of precursors of con- trolled substances when, with intent to manufacture a controlled sub- stance unlawfully, he possesses at the same time:
(a) carbamide (urea) and propanedioc and malonic acid or its derivatives; or
(b) ergot or an ergot derivative and diethylamine or dimethyl- formamide or diethylamide; or
(c) phenylacetone (1-phenyl-2 propanone) and hydroxylamine or ammonia or formamide or benzaldehyde or nitroethane or methylamine.
(d) pentazocine and methyliodide; or
(e) phenylacetonitrile and dichlorodiethyl methylamine or dichlor- odiethyl benzylamine; or
(f) diephenylacetonitrile and dimethylaminoisopropyl chloride; or
(g) piperidine and cyclohexanone and bromobenzene and lithium or magnesium; or
(h) 2, 5-dimethoxy benzaldehyde and nitroethane and a reducing agent.