checkstyle: fix unused import
@@ -33,7 +33,6 @@ import de.learnlib.api.oracle.MembershipOracle;
import de.learnlib.api.query.DefaultQuery;
import de.learnlib.datastructure.discriminationtree.MultiDTree;
import de.learnlib.datastructure.discriminationtree.model.AbstractWordBasedDTNode;
-import de.learnlib.datastructure.discriminationtree.model.AbstractWordBasedDiscriminationTree;
import de.learnlib.datastructure.discriminationtree.model.LCAInfo;
import de.learnlib.util.mealy.MealyUtil;
import net.automatalib.automata.transout.MealyMachine;
