Current State ID: 8
Current State Description: Block A is on the table and clear. Block B is on block D and clear. Block C is on the table and clear. Block D is on the table and not clear. The hand is empty.

Child State ID: 12
Action Taken: unstack(block_b, block_d)
State Description: Block A is on the table and clear. Block B is held by the hand and is not clear. Block C is on the table and clear. Block D is on the table and clear. The hand is holding block B.

Child State ID: 13
Action Taken: pick-up(block_a)
State Description: Block A is being held by the hand and is no longer clear or on the table. Block B remains on block D and is clear. Block C is clear and on the table. Block D is not clear on the table. The hand is holding block A.

