Instruct: Classify Amazon reviews into positive or negative sentiment
Query: adding to one's repertoire

As someone who uses bonelocks already, I found Mr Pascal's book of interest and of benefit in adding other locks to my repertoire. Whilst most of them are not of use in Judo they are most certainly worth learning. Being able to bring an incident to a close quickly and with control is much better than using more than minimum force.Well done Keith!