print_and_log('unique link')

  local result = {}
  table.insert(result, id..' -- ')
  if Links[id] then
    for rel,val in pairs(Links[id]) do
      table.insert(result, rel)
      table.insert(result, ':')
      if type(val) == 'table' then
        table.insert(result, '[')
        for _,dest in ipairs(val) do
          table.insert(result, dest)
          table.insert(result, ' ')
        end
        table.insert(result, ']')
      else
        table.insert(result, val)
      end
      table.insert(result, '|')
    end
  end
  return table.concat(result)