noop
----

noop
----

noop
----

noop
some input
----
some input

noop
some input
----
some input

duplicate
some input
----
some input
some input

duplicate
some input
----
some input
some input

duplicate-with-blank
some input
----
----
some input

some input
----
----

duplicate-with-blank
some input
----
----
some input

some input
----
----

no-output
some input
----
