Current State ID: 1
Current State Description: Block `d` is now held by the hand and is no longer 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 holding block `d`.

Child State ID: 3
Action Taken: put-down(d)
State Description: Block `d` is now on the table and clear. The hand is empty. Block `a` is clear and on top of block `c`. Block `c` is on top of block `b`. Block `b` is on the table.

