S enen e<chr_var letter="s" var="long">∫</chr_var>toit <chr_abbr type="reg" class="dc" expan="pri" cert="no">p-vbar</chr_abbr><chr_var letter="s" var="long">∫</chr_var><chr_var letter="s" var="long">∫</chr_var>e u<chr_abbr type="reg" class="dc" expan="en" cert="no">e-hbar</chr_abbr>g<chr_abbr type="reg" class="dc" expan="an" cert="no">a-hbar</chr_abbr>ce 