} else if ( this.constraints instanceof DoubleBetaConstraints ) {
this.constraints = new DoubleNonIndexSkipBetaConstraints( (DoubleBetaConstraints) this.constraints );
} else if ( this.constraints instanceof TripleBetaConstraints ) {
this.constraints = new TripleNonIndexSkipBetaConstraints( (TripleBetaConstraints) this.constraints );
} else if ( this.constraints instanceof QuadroupleBetaConstraints ) {
this.constraints = new QuadroupleNonIndexSkipBetaConstraints( (QuadroupleBetaConstraints) this.constraints );
}
this.indexedUnificationJoin = true;
}
}