col(1) on OpenBSD

The text 4414e561a992, as OpenBSD 6.6, OpenBSD 6.5, OpenBSD 6.4, OpenBSD 6.3, OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9 shipped it.

filter reverse line feeds and backspaces from input

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