F or<chr_var letter="s" var="long">∫</chr_var> deuant <chr_var letter="s" var="long">∫</chr_var>oi <chr_abbr type="reg" class="ss" expan="com" cert="no">com</chr_abbr>m<chr_abbr type="reg" class="dc" expan="un" cert="no">u-hbar</chr_abbr>t de<chr_var letter="s" var="long">∫</chr_var>gent. 