We need a function ```prime_bef_aft()``` that gives the largest prime below a certain given value ```n```, 

```befPrime or bef_prime``` (depending on the language), 

and the smallest prime larger than this value, 

```aftPrime/aft_prime``` (depending on the language).

The result should be output in a list like the following:

```python
prime_bef_aft(n) == [befPrime, aftPrime]
```

If n is a prime number it will give two primes, n will not be included in the result.

Let's see some cases:
```python
prime_bef_aft(100) == [97, 101]

prime_bef_aft(97) == [89, 101]

prime_bef_aft(101) == [97, 103]
```
Range for the random tests: 
```1000 <= n <= 200000```

(The extreme and special case n = 2 will not be considered for the tests. Thanks Blind4Basics)

Happy coding!!

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'def prime_bef_aft(num):\n    m = 2 - (num%2 == 0)\n    return [next(n for n in range(i, int(i*r), s) if is_prime(n)) for i, r, s in ((max(2, num-m), 0.8, -2), (num+m, 1.2, 2))]\n\n\ndef is_prime(n):\n    factors = 0\n    for k in (2, 3):\n        while n % k == 0 and factors < 2:\n            n //= k\n            factors += 1\n    k = 5\n    step = 2\n    while k * k <= n and factors < 2:\n        if n % k:\n            k += step\n            step = 6 - step\n        else:\n            n //= k\n            factors += 1\n    if n > 1:\n        factors += 1\n    return factors == 1'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'prime_bef_aft'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 6782