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Rabbit Ear is a JavaScript library for computational origami that provides class-based objects for modeling origami crease patterns and folds. It implements the seven origami axioms for precise crease placement, validates flat-foldability using Kawasaki's and Maekawa's theorems, and solves complex layer ordering problems for both single-vertex and global crease patterns. The library handles graph-based representations of origami models, supports various fold operations, and includes algorithms for determining valid mountain-valley assignments and rendering folded states in 2D and 3D.