Category Associations
Only actions from some of the action categories can act upon objects from a particular object category:

Object Category Action Category
Disks A2, A5
Printers A1, A3
Files A2, A3, A4
Text A2, A6

The other actions are inappropriate for these objects:

Object Category Illegal Actions
Disks A1, A3, A4, A6
Printers A2, A4, A5, A6
Files A1, A5, A6
Text A1, A3, A4, A5

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