<2bitr

Theorem.

Arguments:

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

Hypotheses:

()

()

()

Assertions:

()

Proof:

Hyp	Ref	Line	Expr
	Hypo	1	()
		2	()
		3	()
1	bicomi	4	()
2, 3, 4	2bitr	5	()