Parent State ID: 13
State Depth: 7
Action Taken: pick-up(d)
Action Reasoning: To reach the goal state, block `d` needs to be on block `b`. First, we need to pick up block `d` by making it clear.
State Description: The hand is holding block `d`. Block `a` is on the table and clear. Block `b` is on the table and clear. Block `c` is on the table and clear. Block `d` is no longer on the table, and the hand is no longer empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'stack(a, d)', 'unstack(c, b)', 'put-down(c)', 'pick-up(d)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Block `d` is not clear, so the action `pick-up(d)` is invalid.
