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10. May one remove fruits etc that have fallen into pebbles and dirt, from the floor?
One whose fruits have [fallen] into pebbles and dust, may be gathered one at a time in order to eat [right away]. However, he may not place them into a basket or box.
The reason for this is so he does not do a mundane act [which resembles Borer].
 Admur 335:5
 Shabbos Kehalacha 14:45
 Ketzos Hashulchan 146 p. 98 number 2