<employee>
   <empnum>E1</empnum>
   <pnum>P1</pnum>
   <hours>40</hours>
  </employee><employee>
   <empnum>E1</empnum>
   <pnum>P3</pnum>
   <hours>80</hours>
  </employee><employee>
   <empnum>E2</empnum>
   <pnum>P1</pnum>
   <hours>40</hours>
  </employee><employee>
   <empnum>E2</empnum>
   <pnum>P2</pnum>
   <hours>80</hours>
  </employee><employee>
   <empnum>E4</empnum>
   <pnum>P4</pnum>
   <hours>40</hours>
  </employee><employee>
   <empnum>E4</empnum>
   <pnum>P5</pnum>
   <hours>80</hours>
  </employee>