<chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> di<chr_var letter="s" var="long">∫</chr_var>t a<chr_var letter="s" var="long">∫</chr_var>on fil ma<chr_abbr type="reg" class="dc" expan="in" cert="no">i-hbar</chr_abbr>tena<chr_abbr type="reg" class="dc" expan="" cert="no">t-hbar</chr_abbr> 