This process do not filter solids of different sizes.
ANS-separate solids of different weight

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   Winnowing (by wind and shaking) is a process of separating chaff, dust, dirt, husk and light weight stuff from a little heavier seeds or grains.  This process is done manually by the farmers after collecting grains from the plants from the agricultural fields.

   The mixture i exposed to blowing wind and some shaking is done manually to give the mixture some more exposure to the air.  The unnecessary things other than the grains or seeds get blown away to some distance and the heavier grains fall vertically down.

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