From ... to ...
The activity is in the subsection Basic - Loops.
In the loop, the number of repetitions is given by the numeric range [a; b]. Each time the loop is entered, the counter changes to 1. When b is reached, the loop stops.

The activity in properties must include:
  • "From" — range start;
  • "To" — end of range;
  • "Index" — a variable to store the number of the current iteration.
If a range is specified for a<b, index increases by 1 each time, for a>b — decreases.