Parent State ID: 29
State Depth: 7
Action Taken: pick-up(b)
Action Reasoning: To achieve the goal state, we need to stack block 'b' on block 'c'. Since both blocks 'b' and 'c' are clear and on the table, the next best action is to pick up block 'b'.
State Description: Block 'a' is on top of block 'd', block 'c' is clear and on the table, and block 'b' is held in the hand. The hand is no longer empty. In the diagram, 'b' is lifted from the table, and 'c' remains clear.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(c, b)', 'put-down(c)', 'pick-up(a)', 'stack(a, d)', 'pick-up(b)']
