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I’m struggling to get `timeit` working correctly but this is faster in my limited tests:

```python
l = [123456789, 23456789012, 34567890123]

result = [0, 0, 0]

for idx, row in enumerate(l):
   i = f"{row:011}"
   result[idx] = f"{i[:2]}-{i[2:4]}-{i[4:5]}-{i[5:8]}-{i[8:]}"

print(result)
```