SteveRiley: colorless green ideas sleep furiously
Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo.
For this (and a diagram of it) and other such grammatically correct constructions, see
https://en.wikipedia.org/wiki/Buffal...uffalo_buffalo
For example,
James while John had had had had had had had had had had had a better effect on the teacher.
https://en.wikipedia.org/wiki/James_...on_the_teacher
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