In a large bowl, dissolve yeast in a warm water. Add milk, eggs, sugar, butter, salt and 4 cups flour until smooth. Add enough remaining flour to form a soft dough. Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 1-1/2 hours. Punch dough down; divide into four portions. Shape each into eight rolls; place 20 rolls in a greased 13-in. x 9-in. baking pan. Place 12 rolls in a greased 8-in. square baking pan. Cover and let rise in a warm place until doubled, about 20-30 minutes. Bake at 375° for 15-20 minutes or until golden brown. Brush with butter if desired. Serve warm.