void allCase(string r)
{
int n = s.sise();
string s;
for (i = 0; i < (1 << n); i++)
{
s = r;
for ( j = 0; j < n; j++)
{
if ( i & ( 1 << j) )
{
s[j] = s[j] + ('a' - 'A');
}
}
cout << s << endl;
}
}
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