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Add an extra 1/3 of that measurement. to get your cutting length. For example:  Desired length: 12 inches (30 cm) 12 divided by 3 = 4 inches (10 cm) 12 + 4 = 16 inches (41 cm) 16 inches (41 cm) = cutting length Embroidery floss is a great choice here, but you can use other types of string, like jute or yarn. Use the same color for all 4 strands, or you can use different colors. For a wider 4-strand braid, cut 8 to 12 strands. These strands are divided into 4 groups later on. Gather the strings together, then tie an overhand knot 2 to 3 inches (5.1 to 7.6 cm) from the end. Tape the strings to a flat surface, like a desk, just above the knot. An overhand knot is formed when you coil the string into a loop, then pull the end through the loop. 2 strings to the left and 2 strings to the right. With 8 to 12 strings, you still divide the strings into 4 groups. Each color group is worked as a single strand from now on. Starting from the left, mentally number the strings 1 through 4. Cross the 1st string on the left over the 2nd string. Cross the last string on the right under the 3rd string. Re-number your strings 1 through 4. Take string number 4, and cross it under string number 3. Re-number your strings one last time. Take string number 3, and cross it over string number 2. This process is a little bit like weaving. Cross the 1st string over the middle string. Cross the 4th string under the 3rd string. Cross the new 3rd string over the new left string. Continue until your braid is the length you want, or until you have 2 to 3 inches (5.1 to 7.6 cm) left. Every so often, give all of your strings a tug so that your braid comes out nice and neat. Just like the braid start, tie the end of your braid into an overhand knot. If a lot of string is leftover, cut it off. To wear this as a bracelet, wrap the braid around your wrist, then have someone tie the ends together into a double-knot for you.

Summary:
Decide your braid's length. Cut 4 pieces of string based on your measurement. Knot the strings together, then tape them to a flat surface. Divide the strings into 4 groups. Begin braiding. Continue the braid. Cross the 3rd string over the 2nd string. Repeat the process, starting from the 1st string on the left. Knot the end of the braid, then cut the rest off. Remove the tape from the start of the braid.