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Aflash cut, also called aflash cutover, is an immediate change in a complex system, with no phase-in period.
In theUnited States, some telephonearea codes were split oroverlaid immediately, rather than being phased in with apermissive dialing period. An example is telephonearea code 213, which serves downtownLos Angeles and its immediate environs, split in January 1951 into 213 and714 all at once. Another example is an immediate switch from ananalog television channel to adigital television channel on the same frequency, where the two cannot operate in parallel without interference.
A flash cut can also define a procedure in which multiple components of computer infrastructure are upgraded in multiple ways, all at once, with no phase-in period.
In film, an extremely brief shot, sometimes as short as one frame, which is nearly subliminal in effect. Also a series of short staccato shots that create a rhythmic effect.[1]
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