Current State ID: 13
Current State Description: The hand is holding block c. Block a is on the table and clear. Block b is on the table with block d on top of it. Block d is on block b and is clear. Block c is no longer on the table and is not clear.

Child State ID: 18
Action Taken: put-down(c)
State Description: The hand is empty. Block c is on the table and clear. Block a is on the table and clear. Block b is on the table with block d on top of it. Block d is on block b and is clear. The diagram now shows block c on the table, separate from the other blocks.

Child State ID: 19
Action Taken: stack(c, a)
State Description: The hand is now empty. Block c is stacked on block a, and block c is no longer clear. Block a is no longer clear as it supports block c. Block b remains on the table with block d on top of it. Block d is clear.

