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func ping(x:Int->[Text])
if x > 0
return ["ping: $x"] ++ pong(x-1)
else
return ["ping: $x"]
func pong(x:Int->[Text])
if x > 0
return ["pong: $x"] ++ ping(x-1)
else
return ["pong: $x"]
func main()
assert ping(3) == ["ping: 3", "pong: 2", "ping: 1", "pong: 0"]
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