Question: Recall from Example 8 . 1 5 the ternary betweenness relation B = { x , y , z in R 3 : x <

Recall from Example 8.15 the ternary betweenness relation B ={x, y, z in R3 : x <= y <= z or x >= y >= z}. Show how to con-
struct B using only <=, the relation operators (1,, join, select, project), and standard set-theoretic operations (\cup ,\cap ,,).

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