<chr_abbr type="frq" class="ss" expan="et" cert="yes">et2</chr_abbr> <chr_abbr type="reg" class="sc" expan="tro" cert="no">t-o</chr_abbr>uent .ii. bacin<chr_var letter="s" var="long">∫</chr_var> to<chr_var letter="s" var="long">∫</chr_var>pl<chr_abbr type="" class="" expan="" cert="no">[apost]</chr_abbr>ai<chr_var letter="s" var="long">∫</chr_var> 