Sentence:  A configuration "e" not in the image of "τ", namely "e" ∈ "C" \ "τ"["C"] is called a <WSD>"Garden of Eden</WSD>" (briefly "GOE") "configuration", this biblical terminology being motivated by the fact that GOE configurations only appear as initial configurations. 
Meaning of the word marked with <WSD> tags:  A pattern that can only exist as an initial state and is not reachable from any other state.