Finding a 'Proper Subset'

Hi, I've been having trouble getting a piece of code I've made to find whether a set is a proper subset of another. The code I'm using is the following:

Code:

bool contain(bool arrayA[letter],bool arrayB[letter])
{
	int i,counter,counter2;
	counter=0;
	counter2=0;
	for (i=0;i<letter;i++)
	{
		if (arrayA[i]==arrayB[i]) counter++;
		if (counter==26) return false;
		else break;
	}
	for (i=0;i<letter;i++)
	{
		if (arrayB[i]==true)
		{
			counter++;
			if (arrayA[i]==true) (counter2++);
		}
	}
	if ((counter==counter2)/*&&(counter!=0)*/) return (true);
	else return(false);
}

The problem is, when I run the program, the output always comes out False . Any help is appreciated.

Work out which of the "return false" statements is being invoked, and track back from there.
Put some printf()'s in there to help debug (or use a proper debugger if you have one).
eg
printf ("Returning false because .....\n");