C un<chr_var letter="s" var="long">∫</chr_var> <chr_abbr type="frq" class="ct" expan="cheualier" cert="no">ch[apost]r</chr_abbr><chr_var letter="s" var="long">∫</chr_var> deg<chr_abbr type="reg" class="sc" expan="rant" cert="no">nt-alpha</chr_abbr> bont <chr_var letter="E" var="2">E2</chr_var>. 