<chr_abbr type="frq" class="ss" expan="et" cert="yes">et2</chr_abbr> <chr_abbr type="reg" class="dc" expan="" cert="no">p-hbar</chr_abbr>nt ceual <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr>biel <chr_abbr type="frq" class="ss" expan="et" cert="yes">et1</chr_abbr>buen 