PEDUC							     ISCED97	   LIS recode
  0  unknown									9
  1  no education or pre-school education 					1
  3  primary school  (1-6 years of education)					1
  8  second level, first stage (7-9 years)					1
 10  second level, second stage, I (10 years)					2
 11  second level, second stage, II (11-12)					2
 13  third level (university etc.), I (13-14 years)				3
 15  third level (university etc.), II (15-16 ys.)				3
 17  third level (university etc.), III (17-18 ys.)				3
 19  third level, second stage (18+ years) 					3