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@sorted_els = map  { $_->[0] }
              sort { $a->[1] <=> $b->[1] }
              map  { [$_, complex_calculation($_)] }
              @list;

# swapped $a/$b to get max
($max_el) = map  { $_->[0] }
            sort { $b->[1] <=> $a->[1] }
            map  { [$_, complex_calculation($_)] }
            @list;