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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: Int J Lang Commun Disord. 2013 Apr 11;48(4):351–365. doi: 10.1111/1460-6984.12009
subject:. a Who followed the gorilla?
object: b. Who did the bear follow?
yes/no object: c. Did the lion follow the bear?
yes/no filler: d. Did you hear the word fence?