How do I create this circle pattern in illustrator?

This is what I want to create.

This is what I’ve created so far.

Now I don’t know how to merge 6 circles like above.
Any ideas, Please?

Answer

Select the overlapping shapes and use Divide in the Pathfinder palette to chop the shapes into pieces:

That will look something like this:

Then select the appropriate pieces and use Unite in the Pathfinder palette to recombine them like this:

Attribution
Source : Link , Question Author : catchasingcars , Answer Author : Westside