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The user has used the mouse to select the term shown in the yellow selection box. |
As soon as the term is selected, a menu of possible operations pops up. Nothing is selected in that menu. In the menu, a question mark stands for the selected term. |
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The user now selects an operation to apply. |
After the operation is applied, the result is shown as the next line of the calculation. The user is now ready to consider
the next step. |