Hi,

I have a riddle I am not sure how to solve:
```
user=> (defn just-a-demo-seq[] (println "in just-a-demo-seq") [1 2 3 4 5 6
7 8 9])
#'user/just-a-demo-seq
user=> (def do-not-print-it (apply concat (repeatedly just-a-demo-seq)))
in just-a-demo-seq
in just-a-demo-seq
in just-a-demo-seq
in just-a-demo-seq
#'user/do-not-print-it
```

Question is why `just-a-demo-seq` is invoked 4 times.

We spent some time trying to answer the question to the point of analyzing
RT.java and core.clj and pretty much ruled out `concat`. It seems that
`apply` os somewhat greedy exercising too many elements of the lazy
sequence.

Any insight?

Thanks,
Andy

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