Describir: Network planning and critical path scheduling

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| // __    | ||__      | ||   | || | ||  | |_| ||  | / \ || | |  \ || 
| \\_\ ||  | ||__     _| ||   | \\_/ ||  | .  //   | \_/ || | |__/ || 
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  `---`    `-----`   `--`       `---`    `-` --`    `---`    -----`   
                                                                      
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