The 4 day rule and 4 day corollary can also be used to spot tops and bottoms of long intermediate trends.
The 4 day corollary states that after a long intermediate move the first day counter to the trend following 4 or more days in a row often signals a trend change.
The 4 day rule states that 4 or more days in a row counter to a long intermediate trend is often confirmation of a trend change.