<chr_abbr type="frq" class="ss" expan="et" cert="yes">et2</chr_abbr> <chr_var letter="L" var="9">L9</chr_var>ancel<chr_abbr type="" class="" expan="" cert="no">[apost]</chr_abbr>. iu<chr_var letter="s" var="long">∫</chr_var>q<chr_abbr type="reg" class="dc" expan="" cert="no">n-hbar</chr_abbr> lentree. 