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use Set::Scalar; $s = Set::Scalar->new; ... $e = $s->symmetric_difference($t); $v = $s->unique($t); $c = $s->complement;
use Set::IntSpan qw(grep_set map_set); ... $x_set = xor $set $set_spec; $d_set = diff $set $set_spec; $c_set = complement $set;
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