Current State ID: 37
Current State Description: Block 'a' is on top of block 'd', block 'c' is clear and on the table, and block 'b' is held in the hand. The hand is no longer empty. In the diagram, 'b' is lifted from the table, and 'c' remains clear.

Child State ID: 45
Action Taken: stack(b, c)
State Description: Block 'a' is on top of block 'd', block 'b' is on top of block 'c', and both 'a' and 'b' are clear. Block 'c' is supporting block 'b' and is on the table. Block 'd' is supporting block 'a' and is on the table. The hand is empty.

