This page assumes that you have output from two Littlewood-Richardson calculations which you want combined into domino tableaux.  The Littlewood-Richardson output must be obtained from this page http://young.sp2mi.univ-poitiers.fr/cgi-bin/form-prep/marc/LiE_form.act?action=LRR.  Just copy the output from there to paste into these textareas.

Enter the left and right Littlewood-Richardson outputs into the textareas.  Then press Enter while in one of the textareas.

Pressing Enter again will clear the previous results from the page before displaying new results.

You can put text in the Comment textbox.  The text will be put on the page, above the tableaux.  Pressing Enter while in the Comment textbox has the same effect as pressing Enter in one of the textareas.