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The rule is used when a frame border,
concentrated line, and the speed line are drawn
and when the screen tone is cut.
When you draw the line, the space in the part
where the edge is diagonally cut
is done below and used.
You cannot use the rule with straight edge.
It is because the phenomenon "Botaochi"
in which the line fouls happens.
When you pull the frame border,
it may be convenient for you to use a long rule.
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