M3U1L1L1I1O1N1I1N1G2
13 points
MULLIONING is validvalid
MULLION, to provide with vertical dividing strips [v]
MULLION, to provide the upright division between the panes of a window [v]
MULLION, to provide with vertical dividing strips [v]
MULLION, to provide the upright division between the panes of a window [v]