S idi<chr_var letter="s" var="long">∫</chr_var>t <chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr>n<chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr>l liu <chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr>le <chr_var letter="s" var="long">∫</chr_var>oit 