Improving the accuracy of pocketsphinx

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I am trying to improve accuracy of pocketsphinx using a dictionary (I am using the robocup.launch from pocketsphinx).. I gave a list of words like apple ball bottle

Many a time I noticed that it gives me a combination of these words as the result

apple ball bottle ball etc

Is there a way to solve this problem? Any flag that says output only one of these words and not a combination.