| negative match | R Documentation | 
%nin%
is a convenience operator:
x %nin% table
is equivalent to
!(x %in% table).
  x %nin% table
| x | the values to be matched | 
| table | a values to be match against | 
A logical vector
x <- sample(1:6,12,replace=TRUE)
x %in% 1:3
x %nin% 1:3
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