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The graphic shows an example activity which is represented with a box. Inside the box you can read the text "Name, WBS Number or Name and Duration"

In each corner of the box there is a small box with text inside.

At the top left corner you have the value for Early start (ES) for the activity.

At the bottom left corner you have the value for Late start (LS) for the activity.

At the top right corner you have the value for Early finish (EF) for the activity.

At the bottom right corner you have the value for Late finish (LF) for the activity.

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