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Unlike plain merge-base, merge-base --octopus only requires at least one commit argument; update the synopsis to reflect that. Add a sentence to the discussion that when --octopus is used, we do expect '2' (the common ansestor across all) as the result. Signed-off-by: Vincent van Ravesteijn <vfr@lyx.org> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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