Parent State ID: 23
State Depth: 7
Action Taken: stack(b, a)
Action Reasoning: To progress towards the goal state, where 'b' needs to be on 'a', we should stack 'b' onto 'a'.
State Description: The hand is empty. Block 'b' is on block 'a', making block 'b' not clear. Blocks 'd' remains on the table and clear. Block 'a' is not clear as it supports block 'b', and block 'c' is supporting block 'a', making it not clear.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'put-down(d)', 'pick-up(a)', 'stack(a, c)', 'stack(b, a)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: Preconditions for the action are not satisfied.
