please help me to reverse a function call order

[test123]

On Sunday, 24 July 2022 at 15:49:51 UTC, Salih Dincer wrote:
> On Sunday, 24 July 2022 at 15:11:45 UTC, Salih Dincer wrote:
>> ...But you know this classic recurisive function:
>
> The `permut()` function works with many types, for example 
> `char`.  Look at probability 40: 😀
> ```d
> void main() {
>   int totalCount;
>   ['a', 'd', 'g', 'l', 'n'].permut(totalCount);
>   totalCount.writeln(" permutation found...");
> } /* Output:
>
> ...
> dagln: 25
> dagnl: 26
> dalgn: 27
> dalng: 28
> danlg: 29
> dangl: 30
> dgaln: 31
> dganl: 32
> dglan: 33
> dglna: 34
> dgnla: 35
> dgnal: 36
> dlgan: 37
> dlgna: 38
> dlagn: 39
> dlang: 40
> dlnag: 41
> dlnga: 42
> dngla: 43
> dngal: 44
> dnlga: 45
> dnlag: 46
> dnalg: 47
> dnagl: 48
> ...
> 120 permutation found...
>
> Process finished.
> ```
>
> SDB@

not match by:

1) the element is not repeat

2) the element is position related