WORD UNSCRAMBLING PROGRAM

Uhhh hi i need help for my program. So basically i want my program to list all possible combinations of 4 letters in a word. Ex. The word "TEST" can be unscrambled as TEST, TETS, TSET, TSTE, TTSE, TTES, etc.

I started coding and this is what ive got.
Any help is appreciated.

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 #include<iostream.h>
#include<conio.h>

int main(){
char a[	4];
clrscr();
cout<<"WORD UNSCRAMBLING PROGRAM \n";
cout<<"Enter 4 letter word to be unscrambled: ";
cin>>a;
cout<<"You entered: "<<a<<"\n";
cout<<"Possible combinations: ";

getche();
return 0;
}
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