You can repeatedly play back one or more clips by setting markers for that frame range, such as for looping the animation of only one clip.
Right-click a clip and choose Set In/Out Loop. This sets yellow loop markers at either end of the clip.
To play back a group of clips, multi-select them, then right-click one of the clips and choose Set In/Out Loop. This sets loop markers at the beginning of the first clip and the end of the last clip, as shown below:
Click the Play button in the playback controls below the timeline to stop and start the animation.
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