Write a procedure triples that takes three infinite streams, S, T, and U, and produces the stream of triples (Si, Tj, Uk) such that i ≤ j ≤ k. Use triples to generate the stream of all Pythagorean triples of positive integers, i.e., the triples (i, j, k) such that i ≤ j and i² + j² = k².
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