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<Analysis>
Starting state: there are 5 stacks:
- Stack 1: purple block (alone)
- Stack 2: green block (alone)
- Stack 3: orange block (alone)
- Stack 4: yellow block (alone)
- Stack 5: blue block (alone)
Ending state: there are 4 stacks:
- Stack 1: purple block (alone)
- Stack 2: green block (alone)
- Stack 3: blue block (alone)
- Stack 4: yellow block, orange block, from bottom to top