A grid 1 forms housings 3 distributed so as to form vertical and horizontal rows. Pieces, particularly prismatic pieces with a square base, may be arranged individually in the housings. These pieces are marked generally with letter symbols and some may, moreover, be "blanks", that is to ...
A grid 1 forms housings 3 distributed so as to form vertical and horizontal rows. Pieces, particularly prismatic pieces with a square base, may be arranged individually in the housings. These pieces are marked generally with letter symbols and some may, moreover, be "blanks", that is to ...