F or<chr_var letter="s" var="long">∫</chr_var> del duel <chr_abbr type="reg" class="sc" expan="qua" cert="no">q-alpha</chr_abbr>u cuer me de<chr_var letter="s" var="long">∫</chr_var>c<chr_abbr type="reg" class="dc" expan="ent" cert="no">et-hbar</chr_abbr> 