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  • The Siegel modular variety of degree two and level four (by Ronnie Lee and Steven H. Weintraub) 0. Introduction 1. Algebraic background 2. Geometric background 3. Taking stock 4. Type III A 5. Type II A 6. Type II B 7. Type IV C 8. Summing up Cohomology of the Siegel modular group of degree two and level four (by J. William Hoffman and Steven H. Weintraub) 1. Introduction 2. The building 3. Cycles 4. The main theorems.