Current State ID: 3
Current State Description: Block d is on the table and clear. Block a is clear and on top of block c. Block c is on top of block b. Block b is on the table. The hand is empty.

Child State ID: 6
Action Taken: unstack(a, c)
State Description: Block a is held in the hand. Block c is clear and on top of block b. Block b is on the table. Block d is on the table and clear. The hand is holding block a.

