 approvals from 1939 to 2019 as the data source, it is demonstrated that US approvals are found to have a distinct S-shaped (trichotomized) long-range CHE structure : an 8-year (1939-1947) Stagnated (random;
<clarity>  approvals from 1939 to 2019 as the data source, it is demonstrated that US approvals are found to have a distinct S-shaped (trichotomized) long-range CHE structure : an 8-year (1939-1947) Stagnated (random;
 approvals from 1939 to 2019 as the data source, it is demonstrated that the CHE has a distinct S-shaped (trichotomized) long-range CHE structure : an 8-year (1939-1947) Stagnated (random;