Each other---------vs----------One another

Hi friends, another tip for this day.

Do you know the difference between
"each other" and "one another"?
..
Each other :
If only 2 persons are involved, we should use "each other".
..
Examples:
Those two brothers are quarreling with "each other".
Husband and wife are helping "each other".
..
One another :
If more than 2 persons are involved,
we should use "one another".
..
Examples:
Those four children are always complaining about "one another".
We all eight members should help "one another".
Friends, now write your own examples.
By Sri Dhar