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  What do the icons in the lesson list signify?

Father lesson /Son lesson

The chains of the son lessons are vertical when they are all displayed and horizontal if only some of them are present.

The " son lessons" only differ by their place.
If they are de-positioned, they will once again form a single lesson (1 single line).
The son lessons differ only in characteristics that do not influence the place (memo, type, etc.). If they are de-positioned, several lines will remain in the list but you can search for a common place for them by selecting the "Father lesson".
 The son lessons differ in characteristics that make it impossible to find a common place for them (duration, subject, etc.). Each son lesson must be selected and placed independently; there is no guarantee that the same place can be found for all.
The lesson is associated with an oral exam. The pictogram is red when there is something to report.

Placement properties

Stationary lessons
Stationary lessons with movable class meetings
Variable lessons
Variable lessons with movable class meetings
Variable lessons with cumulative class meetings

Lesson status

Unplaced lesson
Placed lesson
Lessons locked in the same place
Locked lesson
Lessons in failure

Room capacity in relation to the number of students in the lesson

Room occupancy of the lesson is less than 85%.
Room occupancy of the lesson is between 85 and 90 % 
The capacity of the room is insufficient for the number of students in the lesson
The capacity of the room is greater than the number of students in the lesson ("x3" indicates "3 times" greater)

Number of class meetings that can be placed

All the class meetings can be placed
All the class meetings can be placed but this requires splitting the lesson, which means creating son lessons.
Not all class meetings can be placed.
Not all class meetings may be placeable, requiring the lesson to be split, for example, the creation of son lessons.