In a large bowl, combine dry pudding mixes, dry gelatin, dry milk powder, and Diet Mountain Dew. Mix well using a wire whisk. Blend in Cool Whip Free. To assemble, layer half of sponge cake pieces in a trifle or large serving bowl, layer half of strawberries over sponge cake pieces, and spoon half of pudding mixture over top. Repeat layers. Evenly sprinkle walnuts over top. Cover and refrigerate for at least 2 hours.
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