"I know," Matilda said. "I've tried quite a few times but mine are never any good."
"You have, have you?" Miss Honey said, more startled than ever.
"Well Matilda, I would very much like to hear one of these limericks you say you have written. Could you try to remember one for us?" (from the novel Matilda)
I know that this sentence is relative clauses:
limericks you say you have written
Is this right sentence?
limericks (which) you have written (which) you say.