D(4)xO(15)=60. I(9)xF(6)=54... wait, this is D(4)xO(15)=60, I(9)xF(6)=54. Let's re-verify: D(4)+O(15)=19, 19*? No. Let's try: Position values multiplied: D(4)xO(15)=60. I(9)xF(6)=54. If IF=90, maybe 9*10? No. Let's use standard positional multiplication: A(1)xM(13)=13.
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