Season 4 (1977)

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Episode 1
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February 20, 1977

Episode 1 of Season 4 premiered on February 20, 1977

Episode 2
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March 20, 1977

Episode 2 of Season 4 premiered on March 20, 1977

Episode 3
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May 15, 1977

Episode 3 of Season 4 premiered on May 15, 1977