{% for fn in footnotes %}
{% if fn.ref_id is iterable %}
{#
// Output footnote that has more than one reference to it in the body.
// The only difference is to insert backlinks to all references.
// Helper: we need to enumerate a, b, c...
#}
{% set abc = "abcdefghijklmnopqrstuvwxyz"|split('') %}
{% set i = 0 %}