S ile<chr_var letter="s" var="long">∫</chr_var> alu<chr_abbr type="reg" class="dc" expan="" cert="no">mt-hbar</chr_abbr> <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> e<chr_var letter="s" var="long">∫</chr_var><chr_abbr type="reg" class="dc" expan="" cert="no">p-hbar</chr_abbr>ndent 