Parent State ID: 1
State Depth: 2
Action Taken: unstack(c, d)
Action Reasoning: To work towards the goal, we need block c to be on the table. The next logical step is to unstack block c from block d, making block d clear and allowing future actions towards achieving the goal state.
State Description: The hand is holding block 'c'. Block 'a' is on the table. Block 'd' is on top of block 'a' and is clear. Block 'c' is no longer on block 'd'. The hand is not empty, and block 'b' is still in hand.
Action Path: ['unstack(b, c)', 'unstack(c, d)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not empty, making the action invalid.
