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+A pure "function", so this works:
+
+```shell
+$ echo -e 'Aged Brie,3,5\nOther Item,4,5' |\
+    ./gilded_rose.sh |\
+    ./gilded_rose.sh |\
+    ./gilded_rose.sh
+Aged Brie,0,8
+Other Item,1,2
+```
\ No newline at end of file