The space in between is known as an open reading-frame.

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Leaving such an open-ended time frame relieved the NFLPA of any pressure to get this process approved in a timely manner.

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"We are obviously anxious to be open for trading in both locations in the shortest possible time-frame, but we respect the planning process and this will guide our timing, " she said.

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The change of each frame from oily to sooty, from sleek to parched, from cramped to wide-open, seemed at once abrupt and flowing.

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