Current State ID: 1
Current State Description: Block `a` is on the table and clear. Block `d` is held by the hand and is no longer clear. Block `b` is on the table supporting block `c`, which is clear. The hand is holding block `d`.

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

