Use the profile beside the sheet
The printed questions use this site’s explicit group profile, including at least two naturally used cards when substituting. It is a learning choice, not a universal rule for every table.
Make your own prediction
Open the exercise print view, record valid or invalid, and write one reason. The answer key is on its own following sheet so it can be kept separate during practice.
Printing
ChooseA4 portrait in the browser and inspect preview. The website prints locally and does not submit handwritten answers. Personal and classroom printing is welcome.