Parent State ID: 37
State Depth: 9
Action Taken: stack(d, b)
Action Reasoning: To achieve the goal state with block `a` on block `d`, which is on block `b` on the table, we start by stacking `d` onto `b`, which aligns two blocks correctly with the goal layout while maintaining `a` and `c` as clears for future necessary moves.
State Description: Block `a` is on the table and clear. Block `b` is on the table and has block `d` on top, so it is not clear. Block `c` is on the table and clear. Block `d` is on block `b` and clear. The hand is empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'put-down(a)', 'unstack(c, b)', 'stack(c, b)', 'unstack(c, b)', 'put-down(c)', 'stack(d, b)']

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