Linux grep command

I have a file, called test.txt which contains the bellow contents:

Mouse eats cheese.
Cat eats mouse.
Dog eats cat.
Lamb eats dog.
Worm eats lamb.

Print the line where "Dog" is availabe:
grep 'Dog' test.txt
The output will be:
  Dog eats cat.

Show line above and below of "Dog":
grep -C 1 'Dog' test.txt
The output will be:
  Cat eats mouse.
  Dog eats cat.
  Lamb eats dog.

If I provide - C 2 then output contains 2 lines above and below of the "Dog".




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