The code you provided (R11 L1 R9 L18) seems to follow a format commonly used in puzzles where 'R' stands for "Right," 'L' stands for "Left," and the numbers indicate how many spaces to turn in that direction.
To unlock the safe based on the given instructions:
1. **R11**: Turn the safe's dial to the right 11 clicks.
2. **L1**: Turn it to the left 1 click.
3. **R9**: Turn it to the right 9 clicks.
4. **L18**: Finally, turn it to the left 18