The PBS KIDS Roku channel provides a mix of videos and full-length episodes of 29 children's PBS programs. Many series, such as Clifford the Big Red Dog, offer only sets of clips. In this case, four videos of 11 to 20 clips each, each 30 to 40 minutes in length. Other shows-Cat in the Hat, for example-have both complete and video sets. Tap the icon of the PBS app on your Roku screen. You will find a seven-digit activation code on the screen.

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