Datasets:
(A) | |
| | Col 1 | Col 2 | Col 3 | | |
| Row 1 | _ | _ | _ | | |
| Row 2 | # | _ | _ | | |
| Row 3 | @ | _ | * | | |
(B) | |
| | Col 1 | Col 2 | Col 3 | Col 4 | Col 5 | Col 6 | Col 7 | Col 8 | | |
| Row 1 | # | # | _ | _ | _ | # | _ | # | | |
| Row 2 | _ | _ | _ | # | # | _ | _ | _ | | |
| Row 3 | _ | _ | _ | # | _ | # | _ | _ | | |
| Row 4 | _ | _ | _ | _ | * | _ | _ | _ | | |
| Row 5 | # | # | _ | _ | _ | # | _ | _ | | |
| Row 6 | _ | _ | _ | _ | _ | _ | _ | _ | | |
| Row 7 | # | _ | # | _ | _ | # | @ | # | | |
| Row 8 | _ | # | _ | _ | _ | # | # | # | | |
(C) | |
| | Col 1 | Col 2 | Col 3 | Col 4 | | |
| Row 1 | _ | _ | @ | _ | | |
| Row 2 | _ | _ | _ | _ | | |
| Row 3 | _ | _ | _ | * | | |
| Row 4 | _ | _ | _ | # | | |
(D) | |
| | Col 1 | Col 2 | Col 3 | Col 4 | | |
| Row 1 | _ | _ | _ | * | | |
| Row 2 | _ | # | _ | _ | | |
| Row 3 | # | _ | @ | # | | |
| Row 4 | _ | _ | _ | _ | | |