<assign>

  >--+-- ELElist --.                          .------------.
    |             |                         /             |
    ‘-- REFlist --+-- ADD --+-- <eltype> --*-- <eltype> --|
                  |                        |              |
                  |                        ‘--------------+-->
                  |
                  ‘-- REMove --+-- ALL -->
                               |                .------------.
                               |               /             |
                               ‘-- <eltype> --*-- <eltype> - |
                                              |              |
                                              ‘--------------+-->

<eltype> is any MODEL, PADDLE, LEXICON, CATALOGUE or Specification element type: see the appropriate user documentation for lists.