List
constant
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Fan a list into a stream, drop the items that fail a predicate, then gather what survived back into a list. Two nodes carry the lesson: Collection is the fan-out — a list fed straight into a stream operator arrives as one item — and Collect is the reverse, without which an output on a stream shows only the last value that passed.
Output
2 [ "a much longer line worth keeping", "another long enough line" ]
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