Parent State ID: 49
State Depth: 13
Action Taken: unstack(c, b)
Action Reasoning: To achieve the goal state, block 'd' needs to be on top of block 'c' on the table. Since block 'd' is already on block 'c', the next step is to unstack block 'c' from block 'b' and place it on the table. This will allow us to stack block 'd' on block 'c' without interference.
State Description: Block 'a' is on the table and clear. Block 'c' is held in the hand and clear. Block 'b' is on the table and clear. Block 'd' is on top of block 'c' and supporting. The hand is holding block 'c'.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'put-down(a)', 'pick-up(d)', 'stack(d, c)', 'unstack(d, c)', 'stack(d, c)', 'unstack(d, c)', 'stack(d, c)', 'unstack(d, c)', 'stack(d, c)', 'unstack(c, b)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Block 'c' is not clear, making the action invalid.
