Datasets:
| (A) | |
| - Stack with yellow block | |
| - Stack with green block, red block, from bottom to top | |
| - Stack with orange block, purple block, from bottom to top | |
| (B) | |
| - Stack with purple block | |
| - Stack with orange block, green block, red block, blue block, from bottom to top | |
| (C) | |
| - Stack with orange block | |
| - Stack with green block, red block, purple block, blue block, from bottom to top | |
| (D) | |
| - Stack with purple block | |
| - Stack with green block, orange block, yellow block, red block, from bottom to top | |