Ternary optical coder , decoder and ternary logical calculus belong to key components of ternary optical computer, and they are the base of implementing other components of the optical computer.
三值光编码、解码器和三值逻辑运算器是三值光计算机关键部件，是实现三值光计算机其它部件的基础。
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The paper lists four groups of homonymy syndromes. It points out that the knowledge of medicine for a coder is the key to code the diseases correctly.