- debug_log "inner loop #{inner}"
- debug_log "tree: #{serialize_els doc.children, false, true}"
- debug_log "open_els: #{serialize_els open_els, true, true}"
- debug_log "afe: #{serialize_els afe, true, true}"
- debug_log "ca: #{ca.name}##{ca.id} children: #{serialize_els ca.children, true, true}"
- debug_log "fe: #{fe.name}##{fe.id} children: #{serialize_els fe.children, true, true}"
- debug_log "fb: #{fb.name}##{fb.id} children: #{serialize_els fb.children, true, true}"
- debug_log "node: #{node.serialize true, true}"