ONLY FOR GENIUS:
29 - 1 = 10
9 - 1 = 10
14 - 1 = 15
11 - 1 = ?

10 (Roman numerals are used in all lines)

ONLY FOR GENIUS:
29 - 1 = 10
9 - 1 = 10
14 - 1 = 15
11 - 1 = ?

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