1<?xml version="1.0" encoding="UTF-8"?><out xmlns:set="http://exslt.org/sets"> 2 Containing i and no e: 3 Paris; 4 Madrid; 5 Calais; 6 7 Containing e and no i: 8 Barcelona; 9 Hannover; 10 11 Containing B and no i and no e: 12 Bonn; 13 14 15 16 17 Containing i: 18 Paris; 19 Madrid; 20 Vienna; 21 Calais; 22 Berlin; 23 24 Containing B: 25 Barcelona; 26 Bonn; 27 Berlin; 28 29 Empty set: 30 </out>