Current State ID: 43
Current State Description: Block 'a' is on top of block 'b'. Block 'b' is on the table and supporting block 'a'. Blocks 'c' and 'd' are on the table and clear. The hand is empty. The diagram would show block 'a' on block 'b', with block 'b' marked as supporting and the hand empty.

Child State ID: 47
Action Taken: pick-up(d)
State Description: Block 'a' is on top of block 'b'. Block 'b' is on the table and supporting block 'a'. Block 'c' is on the table and clear. Block 'd' is held in the hand. The hand is not empty. The diagram would show block 'a' on block 'b', block 'c' on the table, and block 'd' held by the hand.

