From this PERT/CPM network,create a list of activities and their predecessors. 
Definitions:
Erie Canal
A historically significant man-made waterway in New York State, opened in 1825, which connected the Great Lakes with the Atlantic Ocean, facilitating trade and migration.
Steel Plow
An agricultural implement invented by John Deere, making it easier to till the tough prairie soil of the United States.
Factory System
A method of manufacturing using machinery and division of labor, characteristic of the Industrial Revolution, and significantly evolved from previous methods of manual and home-based production.
Power-Driven Machinery
Machines that operate using an external source of power, such as electricity, steam, or fuel, allowing for more efficient production processes in various industries.
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