The spelling box is a 6 column by 5 row matrix labeled horizontally and vertically with single digits.
2.
Dot-matrix variable message signs are divided into three subgroups : character matrix, row matrix, and full matrix.
3.
A row matrix VMS is a hybrid of the two types, divided into two or three rows like a character matrix display, except each row is a single long dot matrix display instead of being split per character horizontally.
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