<chr_abbr type="reg" class="ss" expan="com" cert="no">com</chr_abbr> <chr_var letter="s" var="long">∫</chr_var>el de co <chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr> <chr_abbr type="reg" class="sc" expan="uro" cert="no">u-o</chr_abbr> uee<chr_var letter="s" var="long">∫</chr_var> 