<chr_abbr type="reg" class="dc" expan="" cert="no">P-til</chr_abbr> ce <chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr>diu<chr_var letter="s" var="long">∫</chr_var> force <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> u<chr_abbr type="reg" class="dc" expan="er" cert="no">[apost]</chr_abbr>tu 