Once upon a pond, there lived a <e1>froggery</e1> of Muppet <e2>frogs</e2> and their leader, Kermit the Frog.
Once upon a pond,
Once upon a pond, there lived a froggery of Muppet frogs and their leader, Kermit the Frog.
<triplet> froggery <subject> frogs <object> Member-Collection(e2,e1)