47*31 + 31*19 + 16*19 = 47*31 + 31*3 + 31*16 + 16*19 =
31*(47 + 3) + 16*(31 +19) = 50*31 + 16*50 = 50*(31 + 16) = 50*47 = 2350
47*31 + 31*19 + 16*19 = 47*31 + 31*3 + 31*16 + 16*19 =
31*(47 + 3) + 16*(31 +19) = 50*31 + 16*50 = 50*(31 + 16) = 50*47 = 2350