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diff --git a/source/know/concept/orthogonal-curvilinear-coordinates/index.md b/source/know/concept/orthogonal-curvilinear-coordinates/index.md
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--- a/source/know/concept/orthogonal-curvilinear-coordinates/index.md
+++ b/source/know/concept/orthogonal-curvilinear-coordinates/index.md
@@ -18,10 +18,10 @@ where at least one of the coordinate surfaces is curved:
e.g. in cylindrical coordinates, the coordinate line of $$r$$ and $$z$$ is a circle.
Here we limit ourselves to **orthogonal** systems,
where the coordinate surfaces are always perpendicular.
-Examples of such orthogonal curvilinear systems include
+Examples of such orthogonal curvilinear systems are
[spherical coordinates](/know/concept/spherical-coordinates/),
-[cylindrical polar coordinates](/know/concept/cylindrical-polar-coordinates/),
-[cylindrical parabolic coordinates](/know/concept/cylindrical-parabolic-coordinates/),
+[polar cylindrical coordinates](/know/concept/polar-cylindrical-coordinates/),
+[parabolic cylindrical coordinates](/know/concept/parabolic-cylindrical-coordinates/),
and (trivially) [Cartesian coordinates](/know/concept/cartesian-coordinates/).