Answer Posted / skybeaver

static public string StupidQuestion(string x, string y)
{
StringBuilder sb = new StringBuilder();
Hashtable ht = new Hashtable();

// just one pass through y
foreach( char c in y.ToCharArray() )
if( !ht.Contains(c) )
ht.Add(c, c)

// just one pass thru x
foreach( char c in x.ToCharArray() )
if( !ht.Contains(c) )
sb.Append(c);

return sb.ToString();
}

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