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    $x->range($a, $b)
        Return all elements $i in $x such that $a <= $i < $b. If $a is
        undef, treat it as less than all elements in $x. If $b is unde
+f,
        treat it as greater than all elements in $x.

@foo = grep { something } $x->range($a, $b)
$y->insert($x->range($a, $b))