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A term purification can refer to:
The device to separate mixtures. Watch filter (chemistry), filter (water), filter (air), pneumatic filter.
The device to dislodge or even prevent certain wavelengths (colors) of weak. View filter (optics), filter (photography), infrared filter
The programme to run the information stream. Look at filter (software), filter (Unix), mail filter, printer filter, Internet filter, lameness filter.
An electronic or even even mechanical device, or mathematical algorithmic program, for affecting a harmonic content of signals. Watch electronic filter, signal processing, audio filter.
Within math, the certain rather subset of a partially ordered set. Watch filter (mathematics)
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