On Each image:

1. If you perceive a symmetry:

• First choose symmetry type (rotation or reflection);

• If it is a rotation symmetry, label its rotation center (one click);

• If it is a reflection symmetry, label the two ends of the reflection axis (two clicks).

2. If you label anything by mistake: Clear Last Label.

3. If you do not perceive any symmetries: SKIP.

4. If you finish all symmetry labeling: Submit.