Parent State ID: 41
State Depth: 9
Action Taken: pick-up(b)
Action Reasoning: To progress towards the goal, we should move block 'b' onto block 'a' by picking up 'b', as block 'd' is currently clear and does not need to be moved yet.
State Description: The hand is now holding block 'b'. Block 'a' remains on block 'c', and block 'd' is on the table and clear. Block 'b' is no longer on the table.
Action Path: ['unstack(c, d)', 'put-down(c)', 'unstack(d, a)', 'stack(d, b)', 'pick-up(c)', 'put-down(c)', 'pick-up(a)', 'stack(a, c)', 'pick-up(b)']
