Attempt Number: 2
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
To achieve our goal, we need 'a' on 'c'. First, we must clear the stack on 'c', starting with moving 'd'. The next step is to pick up 'd', since it's clear.

New State Description:
Block 'a' is on the table and clear. The hand is holding block 'd'. Block 'b' is clear and on block 'c'. Block 'c' is on the table, supporting block 'b'. The hand is not empty.

Action Chosen:
pick-up(block_d)
