"Wait for\nan event\nto happen" -> "Handle an\nevent" [label="Something happened...\n", tailport="n", headport="n"]
"Handle an\nevent" -> "Wait for\nan event\nto happen" [tailport="s", headport="s"]
"Wait for\nan event\nto happen" -> "Handle an\nevent" [label="Something happened...\n", tailport="n", headport="n"]
"Handle an\nevent" -> "Wait for\nan event\nto happen" [tailport="s", headport="s"]