Parent State ID: 5
State Depth: 5
Action Taken: stack(a, c)
Action Reasoning: Block 'c' needs to be the base for the other blocks. Since 'c' is clear and on the table, I will stack 'a' onto 'c' as the next step toward the goal configuration.
State Description: The hand is empty. Block 'c' is on the table and is now supporting block 'a'. Block 'b' is on the table and clear. Block 'a' is on top of block 'c' and is supporting block 'd'. Block 'd' is on top of block 'a' and is clear.
Action Path: ['unstack(b, c)', 'put-down(b)', 'unstack(c, d)', 'put-down(c)', 'stack(a, c)']

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