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A binary eutectic phase diagram, like the one shown below, has how many two-phase regions? Temperature (C) 1200 1000 O 800 600 O 400 200 4 O 3 01 2 C iCul B 8.0 (C) -Solidus Solvis 20 a +L Composition (at% Ag) 40 -Liquidus 779C (T) 40 w+B Liquid 60 Composition (wt% Aut 60 E 71.9 (C) 80 80 B+L 91.2 (CPR) G 100 B TE H 2200 2000 1800 F 1600 1400 1200 1000 800 600 400 100 [AD] Temperature (F)