Current State ID: 5
Current State Description: Block a is on block b, block c is held in the hand, and block d is on the table. Blocks a and d are clear. The hand is holding block c.

Child State ID: 9
Action Taken: stack(c, a)
State Description: Block a is on block b, block c is on block a, and block d is on the table. Blocks c and d are clear. The hand is empty.

