Dear Group,
I have data like the following

id   contacts_list   number of contacts
---------------------------------------------------
1   3 4                               2
2   1 3 4                            3
3    4 2 1                           3
4    1                                1
------------------------------------------------------


can you kindly please sugest a data type in R to use for it?
i thought about data frame that consists of a  list element. but  lists are not in  the same length, any  solutions?
thanks in advance
RAE
 		 	   		  
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