<chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> ma<chr_abbr type="reg" class="dc" expan="in" cert="no">i-hbar</chr_abbr>t <chr_abbr type="reg" class="dc" expan="pri" cert="no">p-vbar</chr_abbr><chr_var letter="s" var="long">∫</chr_var>on no<chr_var letter="s" var="long">∫</chr_var> arendu’ 