+"\n"
+"THINGS is a list of comma separated words that can include:\n"
+" `state' describe the states\n"
+" `itemset' complete the core item sets with their closure\n"
+" `lookahead' explicitly associate lookaheads to items\n"
+" `solved' describe shift/reduce conflicts solving\n"
+" `all' include all the above information\n"
+" `none' disable the report\n"