C :

#include<stdio.h>
int main()
{
int a,b,c,d,e,f,first=1;
for(a=0;a<=1;a++)
for(b=0;b<=1;b++)
for(c=0;c<=1;c++)
for(d=0;d<=1;d++)
for(e=0;e<=1;e++)
for(f=0;f<=1;f++)
{
if(a==1||b==1)
{
if(a==0||d==0)
{
if((a==1&&e==1)||(a==1&&f==1)||(e==1&&f==1))
{
if((b==1&&c==1)||(b==0&&c==0))
{
if((c==1&&d==0)||(c==0&&d==1))
{
if((d==0&&f==0)||(d==1&&f==1)){
if(a==1){if(first)first=0;else printf(" ");printf("A");}
if(b==1){if(first)first=0;else printf(" ");printf("B");}
if(c==1){if(first)first=0;else printf(" ");printf("C");}
if(d==1){if(first)first=0;else printf(" ");printf("D");}
if(e==1){if(first)first=0;else printf(" ");printf("E");}
	printf("\n");
break;
}
}
}
}
}
}
}
return 0;
}

C++ :

#include <iostream>
using namespace std;
int main(){
	int a,b,c,d,e,f,A=0,B=0,C=0,D=0;
	for(a=0;a<=1;++a){
		for(b=0;b<=1;++b)
			for(c=0;c<=1;++c)
				for(d=0;d<=1;++d)
					for(e=0;e<=1;++e)
						for(f=0;f<=1;++f){
							if((a+b>=1)&&(a+d<2)&&(a+e+f==2)&&(b+c==0||b+c==2)&&(c+d==1)&&((d==0&&f==0)||(d==1&&f==1))){
								
								if(a)cout<<'A'<<" ";
								if(b)cout<<'B'<<" ";
								if(c)cout<<'C'<<" ";
								if(d)cout<<'D'<<" ";
								if(e)cout<<'E'<<" ";
								if(f)cout<<'F'<<" ";
								cout<<endl;
							}
						}
					
	}
	return 0;
}

Pascal :

begin
 writeln('A B C E');
end.