Attempt Number: 3
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
From the current state, block C should be the base of our goal stack, so picking up block D is the first step to stacking it on block C. This is a strategic move to begin creating the goal structure from the ground up.

New State Description:
Block A is on the table and clear. Block B is on the table and clear. Block C is on the table and clear. Block D is held by the hand and not clear. The hand is holding block D. The table is supporting blocks A, B, and C.

Action Chosen:
pick-up(block_d)
