Rule A: Don't. Rule A1: Rule A doesn't exist. Rule A2: Do not discuss the existence or non-existence of Rules A, A1 or A2.
Source: In Webster's Electronic Quotebase, ed. Keith Mohler, 1994.
-- R D Laing, (Oct 7 1927-1989), English psychiatrist; He was noted for his alternative approach to the treatment of schizophrenia.