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and C1b Build C2a and C2b (No sign) Build RD2a and RD2b Build HTD1b Build HE1b Build HERD1b Exchange signature of C2a and C2b Build BR1a and BR1b Build C3a and C3b (No sign) Build RD3a and RD3b Exchange signature of C3a and C3b Disclose private keys Spend C2b Build and Spend D2b Build and Spend