1. you mean var and year? var is the variable assiociated to year , it couldn't be the same because year= (2006 until 2016) var = different entires. 2.for each year , there is different var , I want to know which var existent in all the period from 2006 to 2016 .For Example : 2006 could contain Tr1 Tr2 Tr3 , and 2007 contains Tr1 Tr2 , so I want to have a table showing me That Tr1 and Tr2 are existent in 2006 and 2007.
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