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The logic followed here is: The 2nd number is cube of the immediately preceding number of the 1st number, i.e., if AB:CD, then CD = (AB - 1)³.
'12 : 1331' = (12 - 1)³ = 11³ = 1331
'14 : 1331' = (14 - 1)³ = 13³ = 2197
'9 : 1331' = (9 - 1)³ = 8³ = 512.
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