# default coordinates of the vertical eight-shaped figure
vertical_eight()
# change the line type
vertical_eight(lty = 2)
# default coordinates of the horizontal eight-shaped figure
horizontal_eight()
# change the line type
horizontal_eight(lty = 2)
# default coordinates of the single vertical eight-shaped figure
s_vertical_eight()
# change the line type
s_vertical_eight(lty = 2)
# default coordinates of a single horizontal eight-shaped figure
s_horizontal_eight()
# change the line type
s_horizontal_eight(lty = 2)
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