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What is the main difference between "super-Earths" and "mini-Neptunes"?
Railroad and Train System
A network of tracks, stations, and supporting infrastructure for the movement of trains, which transport passengers or freight across distances.
Average Workweek
The average number of hours worked per week by employees in a particular firm, sector, or economy.
Industrial Nations
Industrial Nations are countries with significant levels of industrialization and higher standards of living.
Edward Denison
An American economist known for his work on measuring the sources of economic growth.
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