Origami/Techniques/Yoshizawa-Randlett system

Many origami books begin with a description of basic origami techniques which are used to construct the models. The folds are normally described using the Yoshizawa-Randlett diagramming system. There are two main types of origami symbol, lines and arrows. The arrows show how the paper is bent or moved. Lines show various types of edges:
 * A thick line for the edge of the paper
 * A dashed line for a valley fold
 * A dashed and dotted line for mountain folds (there may be one or two dots per dash depending on the author)
 * A thin line for a previous fold
 * A dotted line for a previous fold that's hidden, or sometimes a fold that's not yet made.

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Several different methods have been introduced to point out to the folder to pay attention to a certain spot; these range from a letter or number to a circle, dot, or other geometric symbol.