<chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> b<chr_abbr type="reg" class="dc" expan="ine" cert="no">ie-hbar</chr_abbr> di<chr_var letter="s" var="long">∫</chr_var> <chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr> ie uo<chr_var letter="s" var="long">∫</chr_var> ferroie 