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  $it->{$key}->[$idx]->{section}->[$i]->{'some.doc'}->method1()->[sub1
+(5)]->method2($x);
  # or
  $it->{$key}[$idx]{section}[$i]{'some.doc'}->method1()->[sub1(5)]->me
+thod2($x);

  $it->@( $key $idx section $i some.doc method1() sub1(5) method2($x) 
+);