Double period  block 
Double period
Lessons will be scheduled in single periods unless specified otherwise. Enter double periods in the column Double pers. , if they are desired or permitted. Use this field to specify the distribution of double and single periods:
An entry of 11 indicates that the distribution spans from 1 to 1, i.e. the lesson should be scheduled in exactly one double period.
An entry of 01 means that a 2period lesson can be scheduled in a double period, but it is not an absolute requirement (minimum 0, maximum 1 double period).
An entry of 12 means that a 4period lesson can also be scheduled in one double period or two double periods. The timetable algorithm should decide which variant is better suited regarding the overall timetable perspective.
Tip: Double period requirement If it is possible to allow variability in scheduling double periods (e.g. with the 01 or 12 options), please allow the algorithm to work with these freedoms since this can lead to a significantly better overall result.
Block
More than 2 periods scheduled consecutively are called a block of periods.
If you wish, for example, to schedule 3 periods consecutively, enter '3' in the column 'Block'.
If you wish to schedule a 6period lesson in two blocks of 3, simply enter '3.3'.
