code: function disambiguateRule23(word){
  		// Rule 23 : perCAP -> per-CAP where C != 'r' AND P != 'er'
  		var matches = word.match(/^per([bcdfghjklmnpqrstvwxyz])([a-z])(.*)$/);
  	    if(matches){
  	    	if(matches[3].match(/^er(.*)$/)){
  	    		return
  	    	}
  	        return matches[1] + matches[2] + matches[3];
  	    }
  	}
docs: RULE 23