Parent State ID: 39
State Depth: 8
Action Taken: stack(b, c)
Action Reasoning: The goal is to place block 'b' on top of block 'c'. Since block 'b' is currently held in the hand and block 'c' is clear and on the table, the best action is to stack 'b' on 'c'.
State Description: Block 'b' is now on top of block 'c', and block 'c' is supporting block 'b'. The hand is empty. Block 'a' remains on top of block 'd', and block 'd' is supporting block 'a'. The diagram would show block 'b' stacked on block 'c', with both blocks on the table.
Action Path: ['unstack(d, a)', 'put-down(d)', 'pick-up(a)', 'stack(a, d)', 'unstack(c, b)', 'put-down(c)', 'pick-up(b)', 'stack(b, c)']
