Immediately after this is the phrase 'hereupon' (8 letters) and 'hereon' (6 letters). Both of these terms refer to a point in time that follows something else. Hereupon is used to indicate a moment that immediately follows a particular event or statement, while hereon is used to indicate a period of time that follows a particular event or statement. Both terms are commonly used in legal documents to refer to a specific point in time.