code: public void print() {
  		System.out.println("TechSet: " + this.hashCode());
  		for (Tech tech : includeTech) {
  			System.out.println("\tInclude: " + tech);
  		}
  		for (Tech tech : excludeTech) {
  			System.out.println("\tExclude: " + tech);
  		}
  		
  	}
docs: Useful for debuging ;)