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  1. or download this
    if (not exists $coordinates->{$group}{$id}{$stage}{"coords"}) {
  2. or download this
    if (not exists ${$coordinates}{$group}{$id}{$stage}{"coords"}) {
if (not exists ${${${${$coordinates}{$group}}{$id}}{$stage}}{"coords"}
+)
  3. or download this
    if (not defined $coordinates->{$group}{$id}{$stage}{"coords"}) {
if (!($coordinates->{$group}{$id}{$stage}{"coords"})) {
  4. or download this
    foreach my $coord_no (keys %{$$coordinates{$group}{$id}{$stage}{"coord
+s"}}) {…}
  5. or download this
    if (not exists %{$$coordinates{$group}{$id}{$stage}{"coords"}}) {
exists argument is not a HASH or ARRAY element
  6. or download this
    if (not defined %{$$coordinates{$group}{$id}{$stage}{"coords"}}) {
if (!(%{$$coordinates{$group}{$id}{$stage}{"coords"}})) {
  7. or download this
    if (not exists %{$$original_data{$group}{$id}{$stage}}) {
# exists argument is not a HASH or ARRAY element
...
# works
if (!(%{$$original_data{$group}{$id}{$stage}})) {
# Can't use an undefined value as a HASH reference