Parent State ID: 28
State Depth: 11
Action Taken: stack(d, a)
Action Reasoning: Block 'd' needs to be stacked on block 'a' to achieve the goal state. Since 'd' is clear and on the table, it can directly be stacked on 'a'.
State Description: The hand is empty. Block 'a' is supporting block 'd' and is on top of block 'c'. Block 'b' is clear and remains on the table. Block 'c' is supporting block 'a' and is on the table. Block 'd' is on block 'a' and is clear. The table supports blocks 'b', 'c', and the stack of 'a' and 'd'.
Action Path: ['unstack(b, c)', 'put-down(b)', 'unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(c)', 'put-down(c)', 'pick-up(a)', 'stack(a, c)', 'stack(d, a)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not holding block 'd', violating the precondition for the stack action.
