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# Collection Implementations

## Topics

### Instance Properties

[`var endIndex: SkeletalPoseSet.Index`](/documentation/RealityKit/SkeletalPoseSet/endIndex)

The index of the last pose in a nonempty set.

[`var startIndex: SkeletalPoseSet.Index`](/documentation/RealityKit/SkeletalPoseSet/startIndex)

The index of the first pose in a nonempty set.

### Instance Methods

[`func index(after: SkeletalPoseSet.Index) -> SkeletalPoseSet.Index`](/documentation/RealityKit/SkeletalPoseSet/index(after:))

Returns the index after the given index.

### Subscripts

[`subscript(_:)`](/documentation/RealityKit/SkeletalPoseSet/subscript(_:))

Accesses the pose at the specified index.

[`subscript(SkeletalPoseSet.Index) -> SkeletalPoseSet.Element`](/documentation/RealityKit/SkeletalPoseSet/subscript(_:)-8fm7n)

Accesses the pose at the specified index.

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