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diff --git a/impl/systems/test.eqns b/impl/systems/test.eqns
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+xup = max(0, min(xup + 1, 9 + 1))
+yup = max(0, min(xup + yup, 9 + yup))
+xlow = max(0, xlow-1)
+ylow = max(0, ylow + xlow)