<chr_abbr type="reg" class="sc" expan="Qua" cert="no">Q-alpha</chr_abbr> n<chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr><chr_var letter="s" var="long">∫</chr_var>t bel <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr> gent a cha<chr_var letter="s" var="long">∫</chr_var><chr_abbr type="reg" class="ss" expan="com" cert="no">com</chr_abbr> 