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A description of the geometric design method of the neck that can be generally used for violin, viola, and cello.

To see changing color when wood is exposed to UV light. Experiment up to 600 hours in 100-hour increments to find the most suitable time.

Some bugs have been fixed.

Some functions related to corners have been added/changed.

This program calculates the stiffness and sound velocity of the material using the three resonant frequencies of the violin material.