Arrange the learning structures in the hierarchical order
1. signal-learning structure
2. principle learning structure
3. multiple discrimination learning structure
4. chain -learning structure
5. concept learning structure
1
1, 3, 5, 4, 2
2
1, 2, 5, 4, 3
3
1, 5, 3, 2, 4
4
1, 4, 3, 5, 2