About Und_s metric

[LeeYN-43]

Thanks for you great work!
The "is_contain" function used in computing Und_s seems to have an error.

def is_contain(bb1, bb2):
xl_1, yl_1, xr_1, yr_1 = bb1
xl_2, yl_2, xr_2, yr_2 = bb2
c1 = xl_1 <= xl_2
c2 = yl_1 <= yl_2
"c3 = xr_2 >= xr_2"
c4 = yr_1 >= yr_2
return c1 and c2 and c3 and c4

Shouldn't it be changed to "c3 = xr_1 >= xr_2" ？