Parent State ID: 7
State Depth: 5
Action Taken: pick-up(block_b)
Action Reasoning: To achieve the goal state where block 'a' is on block 'c', we first need to clear block 'c' by moving block 'b'. The next logical step is to pick up block 'b' since it is clear and on block 'c'.
State Description: Block 'a' is on the table and clear. Block 'b' is in the hand and not clear. Block 'c' is on the table and clear. Block 'd' is on the table and clear. The hand is holding block 'b'.
Action Path: ['unstack(block_a, block_d)', 'put-down(block_a)', 'unstack(block_d, block_b)', 'put-down(block_d)', 'pick-up(block_b)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: block_b is not directly on the table, violating a precondition.
