how to trim with two Cylinder solid pipe model?

hi all,

When i make up two Cylinder solid pipe and try to trim each other , it always trim in  one time and can't trim one more time.
i have tried many times to use the "Trim Solids" or "Trim Surfaces", but it can't be make up like as model pipe01,pie02.

Any help would be much appreciated

Thanks
Frank

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