H. P. Grice: “a (past) hearing of a noise is an element in a t.t.s. which is a member of a series of t.t.s.'s such that every member of the series either would, given certain conditions, contain as an element a memory of some experience which is an element in some previous member, or contains as an element some experience a memory of which would, given certain conditions, occur as an element in some subsequent member; there being no subset of members which is independent from all the rest.”

“a (past) hearing of a noise is an element in a t.t.s. which is a member of a series of t.t.s.'s such that every member of the series either would, given certain conditions, contain as an element a memory of some experience which is an element in some previous member, or contains as an element some experience a memory of which would, given certain conditions, occur as an element in some subsequent member; there being no subset of members which is independent from all the rest.”