I Shot an Elephant in My Pyjamas

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Rule 1: a NP followed by a VP is a S

Rule 2: a Vt followed by a NP is a VP

Rule 3: a NP followed by a PP is a S

Rule 4: A Vt followed by a NP then a PP is a VP

Two derivations of Groucho Marx’ claim, ‘I shot an elephant in my pyjamas':