Assertion: car seat's system | /r/HasProperty | 10-position headrest
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Source sentences:
text: For versatility, it includes a 9-position recline and leveling system, 10-position headrest with a no-rethread harness, two crotch buckle positions, two collapsible and removable cup-holders, and FAA approval for air travel (up to stage 3 front-facing with harness).