1. Cut the pillow case so you have equal sides (you can use the other side to make another signal flag).
2. Sketch a square in the center of the flag.
3. Color the square with red paint or cover it with red duct or electrical tape.
In wig-wag code, messages are spelled out according to a letter-number code. Each letter of the alphabet is represented by a combination of numbers, and the numbers correspond to flag movement. A movement to the left of the center means a "1," and a movement to the right of center means a "2." The letter A, for example, is "11," which is two movements from the left to the center in a row. Dipping the flag forward one or more times signals the end of a word, sentence, or message.
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