The Vulcans' clubhouse floor is causing problems. Every time anyone moves, one of the floppy floor tiles gives out. Upon hearing that someone will cut them a rug for their clubhouse floor the Vulcans try to figure out the area of the floor. At first, they put any old objects on the floor and try to rearrange them at the store. Then they hit upon square units.
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Ready to Watch It Figures, Season 1, Episode 20?