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A. Stack 2020 HS Full-A. Stack Proofs-0181A. Stack Proofs-0187A. Stack Proofs-0189A. Stack Proofs-0190A. Stack Proofs-0191A. Stack Proofs-0192A. Stack Proofs-0193A. Stack Proofs-0196A. Stack Proofs-0197A. Stack Proofs-0200A. Stack Proofs-0205