Here's a simple non-OO doubly-linked list:

%hash = (
  this => { PREV => undef, NEXT => 'that', VALUE => 10 },
  that => { PREV => 'this', NEXT => 'those', VALUE => 5 },
  those => { PREV => 'that', NEXT => undef, VALUE => 0 },
);
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You figure out how to use it (it's not that hard).

japhy -- Perl and Regex Hacker