<chr_abbr type="frq" class="ss" expan="et" cert="yes">et2</chr_abbr> gran<chr_var letter="s" var="long">∫</chr_var> pa<chr_abbr type="reg" class="dc" expan="in" cert="no">i-hbar</chr_abbr>ne<chr_var letter="s" var="long">∫</chr_var> <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr>gran<chr_var letter="s" var="long">∫</chr_var> <chr_abbr type="reg" class="sc" expan="tra" cert="no">t-alpha</chr_abbr>ual<chr_var letter="s" var="long">∫</chr_var> 