C h<chr_abbr type="" class="" expan="" cert="no">[apost]</chr_abbr>r uen<chr_abbr type="reg" class="dc" expan="ent" cert="no">et-hbar</chr_abbr> x. <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> di<chr_var letter="s" var="long">∫</chr_var> 