Parent State ID: 32
State Depth: 7
Action Taken: pick-up(b)
Action Reasoning: To achieve the goal state, block 'b' needs to be on top of block 'c'. Since both blocks are clear and on the table, the next step is to pick up block 'b'.
State Description: Block 'b' is held in the hand. Block 'c' remains clear and on the table. Block 'a' is on top of block 'd', and block 'd' is supporting block 'a'. The hand is no longer empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'pick-up(a)', 'stack(a, d)', 'unstack(c, b)', 'put-down(c)', 'pick-up(b)']
