3D-massivimi nutaarneq 1D-massivimut tunngasut
[[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
Ilisarnaat 3D massaakkut 1D massaakkut nutaarluarsiinnik, taakku:
Una tullia: sisamaasat iteration-mut ilisarnaat massaakkut nutaarluarsinnaavoq:
```python
arr = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
flat_list = []

# Iterate through each element
Kiisalu sublist arr-mut:
    Kiisalu subsublist sublist-mut:
        Kiisalu item subsublist-mut:
            flat_list append(item)

print(flat_list)
```

Kingorna: list comprehension-mut ilisarnaat massaakkut nutaarluarsinnaavoq:
```python
arr = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
flat_list = [item Kiisalu sublist arr-mut Kiisalu subsublist sublist-mut Kiisalu item subsublist-mut]

print(flat_list)
```

Killissat kingusseqqaat siunertaq:
`[1, 2, 3, 4, 5, 6, 7, 8]`