Current State ID: 20
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: 32
Action Taken: unstack(block_b, block_d)
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.

