Component selection is a straight forward process. On entering you are presented with a CHOOSE box with all the components and pseudo components. As you pick each component by pressing the OK key a small tick mark will appear next to the component to show that it has been selected.
There are no restrictions - you can have as many components as you want, having too many will simply slow the calculation.
There must be at least two components (this is an HP50g list processing restriction) but you can have duplicates.
When you have finished selecting components press the CANCL key. Pressing the CANCL key with no components selected exits leaving the list unchanged.