Thanks a lot for your answer.
What I really want is a data.frame like this (I am just building it myself):
years
[1] [2] [3] [4]
[1] 2004 2007 NA NA
[2] 2010 2005 NA NA
[3] 2009 2001 NA NA
[4] 2006 2000 2004 2009
[5]2006 2000 NA NA
etc
Thank you very much, and apologies for not being clear enough.
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