    Sentence .1:. The, agreement between “architect   “Daniel Libeskind’: “and. “representatives © of:  developer Larry Silverstein gives architect David  Childs the’ lead role in: devetoping the * Freedom  Tower - Y    Sentence 2:‘The collaboration gives caichitect  David Childs’, who. has-done extensive work with  Silverstein , the lead role in developing thé'tower  i Which is to be the world's tallest.    