code: public boolean isUnary() {
  		Variable oneVar = this.scope[0];
  		for (int i = 1; i < this.scope.length; i++) {
  			if (!this.scope[i].equals(oneVar)) return false;
  		}
  		return true;
  	}
docs: Returns <code>true</code> iff this {@link Constraint}'s scope only refers to one {@link Variable}.
  @return <code>true</code> iff this {@link Constraint}'s scope only refers to one {@link Variable}.