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Glass-wall Roman numeral determinant: spoiler

Q: Find a determinant identity using Roman numerals that can be painted on a glass wall and be valid from both sides. To be interesting it should involve the Roman decrement convention (eg IV = V - I).
rec.puzzles

A: For example

| II  VI    X |
|             |
|  I  II   IV |  =  IV
|             |
| VI  IX  XIX |

Non-spoiler


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