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-rw-r--r--docs/teaching/exercises/figures_classes.svg4
1 files changed, 2 insertions, 2 deletions
diff --git a/docs/teaching/exercises/figures_classes.svg b/docs/teaching/exercises/figures_classes.svg
index 1e2587a82..bac15feda 100644
--- a/docs/teaching/exercises/figures_classes.svg
+++ b/docs/teaching/exercises/figures_classes.svg
@@ -1,6 +1,6 @@
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+<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 20001102//EN' 'https://www.w3.org/TR/2000/CR-SVG-20001102/DTD/svg-20001102.dtd'>
+<svg xmlns="https://www.w3.org/2000/svg" width="1007" height="675">
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