D i<chr_var letter="s" var="long">∫</chr_var>t a <chr_var letter="s" var="long">∫</chr_var>on <chr_abbr type="reg" class="ml" expan="par" cert="no">par</chr_abbr>e b<chr_abbr type="reg" class="dc" expan="" cert="no">n-hbar</chr_abbr> en halt 