AMPL error, duplicate number for set -

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In AMPL, I have a set, which should store some similar values. But I have a "duplicate number" error

Is there any way to do this? What is the easiest way to solve this problem?

is set:

set A;

Data: set A: = 1 1 2;

The element set in AMPL should be unique. To store counterfeit values, use the parameter instead: 

  set s; Ultimate A {S}; Information; Ultimate: S: A: = 1 1 2 1 3 2;

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