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