Current State ID: 44
Current State Description: The hand is now holding block 'd'. Block 'b' is on block 'a' and is clear. Block 'a' is not clear. Block 'c' remains under block 'a' and is not clear. Block 'd' is no longer on the table and is not clear.

Child State ID: 54
Action Taken: stack(d, b)
State Description: The hand is now empty. Block 'd' is on block 'b' and is clear. Block 'b' is not clear and is on block 'a'. Block 'a' is not clear and is on block 'c'. Block 'c' is on the table and not clear.

Child State ID: 55
Action Taken: stack(d, b)
State Description: The hand is now empty. Block 'd' is on block 'b' and is clear. Block 'b' is not clear. Block 'a' is not clear. Block 'c' remains under block 'a' and is not clear. The diagram now shows block 'd' on top of block 'b', completing the stack.

