Assertion: chesterfield | /r/HasProperty | incorporated as cities of their own
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Source sentences:
text: For many years, "Chesterfield" was an all-inclusive place-name for a vast, unincorporated sub-region of western St. Louis County (called "West County" by metro area residents) containing the unincorporated historical communities listed above, plus areas now incorporated as cities of their own (e.g., Ballwin).