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12 cards from this deck
Pairs of numbers showing position of points on a grid
x-axis
y-axis
Point where axes meet, coordinates (0, 0)
(x,y)(x, y)(x,y)
Horizontal distance from origin (right if +, left if -)
Vertical distance from origin (up if +, down if -)
Along the corridor, then up the stairs
Cross (×)
Point exactly halfway between two endpoints
(x1+x22,y1+y22)\left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right)(2x1+x2,2y1+y2)
Add each pair of coordinates and divide by 2
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