#SET{left,#ENV{ltr}|choixsiegal{left,left,right}}
#SET{right,#ENV{ltr}|choixsiegal{left,right,left}}
#SET{rtl,#ENV{ltr}|choixsiegal{left,'',_rtl}}
#SET{left,#ENV{ltr}|choixsiegal{left,left,right}}
#SET{right,#ENV{ltr}|choixsiegal{left,right,left}}
#SET{rtl,#ENV{ltr}|choixsiegal{left,'',_rtl}}