Each space is for two (or one) (or even empty and memorialized).
Lettering is arranged by the cemetery to make sure the final date is always completed.
The attraction of the Columbarium is that it is neat and tidy thus the decoration is left to the cemetery. There are to be no decorations affixed to the columbaria nor left for any length of time. Only temporary decorations (for anniversaries and special dates) are permitted.