@@ -127,7 +127,7 @@ For better intuition, the shape of the U-view of
128 x0 y0 (two)
128 x0 y0 (two)
129 x1 y1 (two)
129 x1 y1 (two)
130− x2 y1 (two)
130+ x2 y2 (two)
133When recursing over this structure, the values of ``xs`` range over
133When recursing over this structure, the values of ``xs`` range over