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+# ass-020
+
+Suppose a user can create, update and delete their buckets and pipes, and
+suppose that when they do so, they see a prominent number which they know
+summarises what the long-term difference between their incomings and outgoings
+will be if they stick to the intentions expressed in their buckets and pipes.
+Then the user will create, update and delete their buckets and pipes so that the
+number is close to zero.