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Base data: length. Shaku-kan system
1 ken＝6 shaku＝1.81818 m
Ken is the space between columns
A ken expresses the space between columns. This is the standard unit for measuring the length of timbers, tatami mats, and shoji screens. It is set at 1 ken 6 shaku according to the Shaku-kan system, but it actually differs from region to region. Therefore, there are many types of tatami mat size such as kyoma, chukyoma, and edoma.
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