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## h, 4 bytes

```
1,-1
```
Neither this program (by VilgotanL) nor [the language](https://esolangs.org/wiki/H) (by Nerdaxe) are mine, but I think the latter is interesting and so I am submitting the former.

Step-by-step guide:
```
Accumulator and index of the current cell start at 0
Acc -> (value of 0th cell)th cell - 0 -> 1st cell -> -1 (0-indexing is used)
Acc is negative, so index of current cell -> 1st cell -> -1
When the index is negative, execution ends
When execution ends, the final program is printed
```