I need to create a JSON from a Map> in which the key and values are paired in such a way : A->{B,C,D} D->{E,F} E->{G,H} G->{I,J,K,L} J->{M,N} and so on.. that is , values can act as a key and also have their own arraylist and nested in such manner. Can anyone help me to make json in flowing w...

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