Finish the three proofs on the board.
Problem 1 has at least 5 lines. (2 givens, 2 proving lines, and the proof line)
Problem 2 has at least 5 lines (2 givens, 2 proving lines, and the proof line)
Problem 3 has at least 8 lines (4 givens, 3 proving lines, and the proof line. The proof line uses CPCTC)
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