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. 2015 Jun 23;6:840. doi: 10.3389/fpsyg.2015.00840
(1a) The man heard that every boy at school said that he was happy.
(1b) The man who every boy at school heard said that he was happy.
(2a) The man heard that the boy at school said that he was happy.
(2b) The man who the boy at school heard said that he was happy.