java.lang.NullPointerException: This exception has no message.
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java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:320)
at Subsets.permutations(Subsets.java:124)
at PlayScopa.computerTurn(PlayScopa.java:273)
at PlayScopa.scopaPlay(PlayScopa.java:133)
at PlayScopa.scopaStart(PlayScopa.java:89)
at MainApp.main(MainApp.java:29)