The reason for including the "not equal to" equivalents is that it provides one more convenience for representing logic in a concise manner. To avoid confusion and improve readability of your decision tables, lowercase values should normally be used throughout and set as the default option in the Ignore Case on Entries setting found in the General tab in the Preferences option of the Edit menu.
The following process shows how to enter condition entries:
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Click on a condition column and enter either a y or n in the box provided or
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Select the Expand option from the Logic drop-down menu. Every possible yes/no combination will be entered automatically into the condition entry area.