Parent State ID: 32
State Depth: 7
Action Taken: stack(b, c)
Action Reasoning: To achieve the goal state, block 'b' needs to be on top of block 'c'. Since both blocks are clear and on the table, the next best action is to stack 'b' on 'c'.
State Description: Block 'a' is on top of block 'd', and block 'd' is supporting block 'a'. Block 'b' is now on top of block 'c', and block 'c' is supporting block 'b'. The hand is empty. In the diagram, 'b' is stacked on 'c', forming a new stack.
Action Path: ['unstack(d, a)', 'put-down(d)', 'pick-up(a)', 'stack(a, d)', 'unstack(c, b)', 'put-down(c)', 'stack(b, c)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not holding block 'b', violating the precondition for the stack action.
