Background

Pretzels are a snack food, which have unique shapes and a hard, shiny
outer surface. They are mass produced using primarily automated machinery.
First developed in the seventh century, pretzels have been called one of
the world’s oldest snack food. A recent market survey found that
the pretzel market in the United States is about $560 million a year with
over 300 million lb (136.2 million kg) of pretzels and pretzel products
being produced. The pretzel market has grown in recent years because
pretzels are considered a more healthy, fat-free snack.

The unique, two looped, knot shape of a pretzel is one of its defining
characteristics. The typical pretzel has a pleasant cracker-like flavor, a
crisp, brittle texture and a brown glossy surface color. Salt crystals are
often sprinkled on its surface to make them taste more appealing. Pretzels
have a moisture content of anywhere from 2-4% and therefore

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Background

A nail consists of a metal rod or shank, pointed at one end and usually
having a formed head at the other, that can be hammered into pieces of
wood or other materials to fasten them together. A nail is usually made of
steel, although it can be made of aluminum, brass, or many other metals.
The surface can be coated or plated to improve its corrosion resistance,
gripping strength, or decorative appearance. The head, shank, and point
may have several shapes based on the intended function of the nail. Of the
nearly 300 types of nails made in the United States today, most are used
in residential housing construction. The average wood frame house uses
between 20,000 and 30,000 nails of various types and sizes.

Nails are divided into three broad categories based on their length. In
general nails under 1 inch (2.5 cm) in length are called

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