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In (a) the focal individual 
learns from an individual 
that is part of 
's interaction network (
). Since 
, both 
and 
have three other interaction partners, whose strategy (
or 
) is indicated by 
, 
, 
and 
, 
, 
, respectively. In (b) 
learns from an individual 
that does not belong to 
's interaction network (
). Now both 
and 
have four different interaction partners.
