We use reciprocal pronouns when each of two or more subjects is acting in the same way towards the other. For example, A is talking to B, and B is talking to A. So we say:
> A and B are talking to each other.
The action is "reciprocated". John talks to Mary and Mary talks to John. 
There are only two reciprocal pronouns, and they are both two words:
  > each other
 > one another
for example -
1 . we gave each other gifts.
2. the 10 prisoners were all blaming one another.
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