L ieuent mat<chr_abbr type="reg" class="dc" expan="in" cert="no">i-hbar</chr_abbr> .<chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> <chr_var letter="s" var="long">∫</chr_var>i <chr_var letter="s" var="long">∫</chr_var>a torn<chr_abbr type="reg" class="dc" expan="en" cert="no">e-hbar</chr_abbr>t. 