Parent State ID: 33
State Depth: 7
Action Taken: stack(b, c)
Action Reasoning: The goal is to have block 'b' on top of block 'c'. Since both blocks are clear and on the table, the best action is to stack 'b' on 'c', moving closer to the goal state.
State Description: Block 'a' is on top of block 'd', and block 'b' is now on top of block 'c'. Block 'd' is supporting block 'a', and block 'c' is supporting block 'b'. The hand is empty. The diagram now shows two stacks: 'a' on 'd', and 'b' on 'c'.
Action Path: ['unstack(c, b)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(a)', 'stack(a, d)', '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.
