How to print the Duplicate data in a form in incremental order using groovy

Summary:

Exporting the Repeated Data Combination in a form in incremental order using Groovy

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I want to print the Data Combination of Repeated Data from a form in an Incremental order using groovy

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I need the output like :
A2→Jan : 50
A3→Feb : 50
A2→Feb : 55
A4→Mar : 55