Repetition of Subject in SPARQL query

[javed khan]

Hello

I have a SPARQL query which results a particular study (article) uses
Decision Tree model and NASA, Maxwell, COCOMO datasets.The answer it shows
like for Study 1:

Decision Tree    NASA
Decision Tree    Maxwell
Decision Tree    COCOMO

While I need like this:

Decision Tree  NASA
                        Maxwell
                        COCOMO


The subject should not be repeated,kindly if some one could guide?

Regards