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Compare sets by evaluating both set differences, and the intersection.
pool(x, y)
vector
list: unique x, unique y, and intersection
Other util: %contains%, as.best, enclose, locf, padded, parens, runhead, text2decimal
%contains%
as.best
enclose
locf
padded
parens
runhead
text2decimal
# NOT RUN { pool(1:3,2:4) # }
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