<chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> ain<chr_var letter="s" var="long">∫</chr_var>coi<chr_var letter="s" var="long">∫</chr_var> doner <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr><chr_abbr type="reg" class="ml" expan="pro" cert="no">pro2</chr_abbr>metre 