Purebred dogs of one breed are genetically distinguishable from purebred dogs of other breeds, but the means by which kennel clubs classify dogs is unsystematic. Systematic analyses of the dog genome has revealed only four major types of dogs that can be said to be statistically distinct. These include the "old world dogs" (e.g., Malamute and Shar Pei), "Mastiff"-type (e.g., English Mastiff), "herding"-type (e.g., Border Collie), and "all others" (also called "modern"- or "hunting"-type).
What are the other modern and hunting types of dogs called?
all others

Since all contact between the wrestlers must cease if any part of the body is touching, or underneath, the ropes, many wrestlers will attempt to break submission holds by deliberately grabbing the bottom ropes. This is called a "rope break", and it is one of the most common ways to break a submission hold. Most holds leave an arm or leg free, so that the person can tap out if they want. Instead, they use these free limbs to either grab one of the ring ropes (the bottom one is the most common, as it is nearest the wrestlers, though other ropes sometimes are used for standing holds such as Chris Masters' Master Lock) or drape their foot across, or underneath one. Once this has been accomplished, and the accomplishment is witnessed by the referee, the referee will demand that the offending wrestler break the hold, and start counting to five if the wrestler does not. If the referee reaches the count of five, and the wrestler still does not break the hold, they are disqualified.
How might a wrestler attempt to break a submission hold?
by deliberately grabbing the bottom ropes

The relational model also allowed the content of the database to evolve without constant rewriting of links and pointers. The relational part comes from entities referencing other entities in what is known as one-to-many relationship, like a traditional hierarchical model, and many-to-many relationship, like a navigational (network) model. Thus, a relational model can express both hierarchical and navigational models, as well as its native tabular model, allowing for pure or combined modeling in terms of these three models, as the application requires.
What is the relationship called in a hierarchical model?
one-to-many