Clicking on the icon
in the menu bar above allows you to add variations to the question.
This is done by building one or more of these three handles:
Random generates a random value within a range (which can optionally
be multiplied by a number);
Choice randomly selects one item from a specified list of items (items are separated by |).
Items are either numbers or strings.
Expression is built from previously-defined
Random, Choice or Expression handles.
Answer simply points to one of the previously-defined
handles (i.e., Random, Choice or an Expression). There should only be one Answer.
Reference is a sequence number of a previously-defined
handle (i.e., Random, Choice or an Expression),
and is used (only) within a question stem (i.e., question text).
Refer to a handle by its sequence number preceded by @.