case 2:
betaSourceConstraints = new DoubleBetaConstraints( list.toArray( new BetaNodeFieldConstraint[2] ),
buildContext.getKnowledgeBase().getConfiguration() );
break;
case 3:
betaSourceConstraints = new TripleBetaConstraints( list.toArray( new BetaNodeFieldConstraint[2] ),
buildContext.getKnowledgeBase().getConfiguration() );
break;
case 4:
betaSourceConstraints = new QuadroupleBetaConstraints( list.toArray( new BetaNodeFieldConstraint[2] ),
buildContext.getKnowledgeBase().getConfiguration() );