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Theorem.

Arguments:

(pr), (pr), (pr), (pr),

Hypotheses:

()

()

()

Assertions:

()

Proof:

Hyp	Ref	Line	Expr
	Hypo	1	()
		2	()
		3	()
2, 3	brpi21	4	()
1, 4	brpi22<	5	()