Перелік елементів m1:
  /home/chief/tmp/b.avi
  /home/chief/tmp/fold/b.avi
  /home/chief/tmp/c.docx
  /home/chief/tmp/fold/c.docx
  /home/chief/tmp/d.png
  /home/chief/tmp/fold/d.png
  /home/chief/tmp/a.txt
  /home/chief/tmp/fold/a.txt

   До RemoveWhere(IsDoc) |m1| = 8
Після RemoveWhere(IsDoc) |m1| = 4

Перелік елементів m1:
  /home/chief/tmp/b.avi
  /home/chief/tmp/fold/b.avi
  /home/chief/tmp/d.png
  /home/chief/tmp/fold/d.png

Файли m1 з розширенням avi:
  /home/chief/tmp/b.avi
  /home/chief/tmp/fold/b.avi

   До m2.ExceptWith(m1) |m2| = 8
Після m2.ExceptWith(m1) |m2| = 4

  /home/chief/tmp/b.avi
  /home/chief/tmp/fold/b.avi
  /home/chief/tmp/d.png
  /home/chief/tmp/fold/d.png
----------------------
  /home/chief/tmp/c.docx
  /home/chief/tmp/fold/c.docx
  /home/chief/tmp/a.txt
  /home/chief/tmp/fold/a.txt
----------------------