those who say it cannot be done should not interrupt those doing it
people who dispute that a task is possible should not impede those people who attempt to do it
plural of systems science
(transitive) To pay heed to; notice; to take notice of, to perceive. / (obsolete, transitive) To pass comment on (something); to indicate, point out.
(zoology) Any flatworm in the family Procerodidae.
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