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Symmetric set complement
symdiff(x, y)
union(setdiff(x,y), setdiff(y,x))
a vector
merge_symdiff and xor
merge_symdiff
xor
symdiff(c(1L,2L,2L), c(2L,3L)) symdiff(c(2L,3L), c(1L,2L,2L))
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